{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for bind is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.\n\nSecurity Fix(es):\n\n* bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling (CVE-2026-19667)\n\n* bind: BIND: Denial of Service via crafted DNSSEC reply (CVE-2026-80274)\n\n* bind: BIND: Denial of Service via malformed DNS64 responses (CVE-2026-19666)\n\n* bind: BIND: Denial of Service via unbounded processing of crafted DNS messages (CVE-2026-19630)\n\n* bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay (CVE-2026-94300)\n\n* bind: bind: Denial of Service via assertion failure during redirect processing (CVE-2026-96888)\n\n* bind: bind: Denial of service via assertion failure in RPZ query processing (CVE-2026-97313)\n\nBug Fix(es) and Enhancement(s):\n\n* bind: Avoid costly reload of IdM named due to logrotate operation [rhel-9.6.z] (JIRA:RHEL-245354)\n\n* bind: New root trust anchor key for DNSSEC [rhel-9.6.z] (JIRA:RHEL-255762)\n\n* bind 9.16 crash with SIGSEGV [rhel-9.6.z] (JIRA:RHEL-280608)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2026:95048", "url": "https://access.redhat.com/errata/RHSA-2026:95048" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "2535435", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535435" }, { "category": "external", "summary": "2535466", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535466" }, { "category": "external", "summary": "2535477", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535477" }, { "category": "external", "summary": "2556406", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556406" }, { "category": "external", "summary": "2556407", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556407" }, { "category": "external", "summary": "2556413", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556413" }, { "category": "external", "summary": "2556415", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556415" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_95048.json" } ], "title": "Red Hat Security Advisory: bind security, bug fix, and enhancement update", "tracking": { "current_release_date": "2026-11-04T12:51:05+00:00", "generator": { "date": "2026-11-04T12:51:05+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.4.4" } }, "id": "RHSA-2026:95048", "initial_release_date": "2026-11-04T08:13:24+00:00", "revision_history": [ { "date": "2026-11-04T08:13:24+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-11-04T08:13:24+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-11-04T12:51:05+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux AppStream EUS (v.9.6)", "product": { "name": "Red Hat Enterprise Linux AppStream EUS (v.9.6)", "product_id": "AppStream-9.6.0.Z.EUS", "product_identification_helper": { "cpe": "cpe:/a:redhat:rhel_eus:9.6::appstream" } } }, { "category": "product_name", "name": "Red Hat CodeReady Linux Builder EUS (v.9.6)", "product": { "name": "Red Hat CodeReady Linux Builder EUS (v.9.6)", "product_id": "CRB-9.6.0.Z.EUS", 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"system_name": "Red Hat Bugzilla ID", "text": "2556406" } ], "notes": [ { "category": "description", "text": "A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending specially crafted Domain Name System (DNS) protocol messages containing an excessive number of specific structures. Because BIND does not impose a limit on processing these structures, handling the malicious request consumes disproportionate amounts of CPU time and memory, resulting in a Denial of Service (DoS).", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: BIND: Denial of Service via unbounded processing of crafted DNS messages", "title": "Vulnerability summary" }, { "category": "other", "text": "This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker can exhaust server CPU and memory resources without requiring privileges, resulting in a denial of service. In Red Hat Enterprise Linux and OpenShift environments, the risk primarily affects BIND instances functioning as recursive resolvers exposed to untrusted traffic. Deployments serving strictly authoritative roles or those isolated from untrusted client queries experience significantly lower exposure to this attack vector.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", 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When a resolver is configured to use DNS64, a specially crafted, malformed answer from an authoritative server can cause the `named` process to exit unexpectedly. This can lead to a Denial of Service (DoS) for clients relying on the affected resolver.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: BIND: Denial of Service via malformed DNS64 responses", "title": "Vulnerability summary" }, { "category": "other", "text": "Important: This denial of service vulnerability affects BIND resolvers configured to use the `dns64` feature. A specially crafted malformed DNS64 response from an authoritative server can cause the `named` process to unexpectedly terminate, leading to service unavailability. Exploitation requires the `dns64` feature to be explicitly enabled in the resolver's configuration.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", 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"category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-19666", "url": "https://www.cve.org/CVERecord?id=CVE-2026-19666" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19666", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19666" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.20.29", "url": "https://downloads.isc.org/isc/bind9/9.20.29" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.21.26", "url": "https://downloads.isc.org/isc/bind9/9.21.26" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2026-19666", "url": "https://kb.isc.org/docs/cve-2026-19666" } ], "release_date": "2026-09-16T14:02:30.453000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-11-04T08:13:24+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer 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"url": "https://access.redhat.com/errata/RHSA-2026:95048" }, { "category": "workaround", "details": "To mitigate this issue, disable the `dns64` feature in the BIND resolver configuration if it is not required. This can be done by removing or commenting out the `dns64` configuration block in `named.conf` or related configuration files. After modifying the configuration, the BIND service (`named`) must be reloaded or restarted for the changes to take effect. 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"system_name": "Red Hat Bugzilla ID", "text": "2535435" } ], "notes": [ { "category": "description", "text": "A flaw was found in `bind9`'s `named` component. A remote attacker, by sending a specially crafted DNS negative answer of exactly 65536 bytes from an authoritative server, can cause a 16-bit length truncation. This results in a zero-byte negative cache entry. When `named` attempts to read this invalid entry, it will unexpectedly terminate, leading to a Denial of Service (DoS).", "title": "Vulnerability description" }, { "category": "summary", "text": "bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling", "title": "Vulnerability summary" }, { "category": "other", "text": "This is an Important denial of service flaw in BIND 9's `named` service. An attacker-controlled authoritative server can trigger a `named` abort by sending a precisely sized negative DNS answer. This vulnerability primarily affects BIND instances configured as recursive resolvers that query untrusted authoritative servers, leading to service disruption.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", 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"https://access.redhat.com/security/cve/CVE-2026-19667" }, { "category": "external", "summary": "RHBZ#2535435", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535435" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-19667", "url": "https://www.cve.org/CVERecord?id=CVE-2026-19667" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19667", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19667" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.20.29", "url": "https://downloads.isc.org/isc/bind9/9.20.29" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.21.26", "url": "https://downloads.isc.org/isc/bind9/9.21.26" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2026-19667", "url": "https://kb.isc.org/docs/cve-2026-19667" } ], "release_date": "2026-09-16T13:46:56.783000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-11-04T08:13:24+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-debuginfo-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-debuginfo-32:9.16.23-31.el9_6.5.ppc64le", 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This prevents the local `named` instance from directly interacting with potentially malicious authoritative servers.\n\nExample configuration in `named.conf`:\n```\noptions {\n forwarders { 192.0.2.1; 192.0.2.2; };\n forward only;\n};\n```\nReplace `192.0.2.1` and `192.0.2.2` with the IP addresses of your trusted upstream DNS servers. After modifying the configuration, restart the `named` service for the changes to take effect. 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A remote attacker, by sending a specially crafted DNSSEC-signed authoritative zone reply, can trigger an unexpected program exit in the validating resolver. This can lead to a Denial of Service (DoS) for the affected BIND resolver.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: BIND: Denial of Service via crafted DNSSEC reply", "title": "Vulnerability summary" }, { "category": "other", "text": "This is an Important denial of service vulnerability in BIND resolvers. When DNSSEC validation is enabled, a specially crafted DNSSEC reply from an authoritative server can cause the BIND resolver to unexpectedly exit, leading to a disruption of DNS resolution services. This impacts the availability of DNS resolution on affected Red Hat systems configured with DNSSEC.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", 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"category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-80274", "url": "https://www.cve.org/CVERecord?id=CVE-2026-80274" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-80274", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80274" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.20.29", "url": "https://downloads.isc.org/isc/bind9/9.20.29" }, { "category": "external", "summary": "https://downloads.isc.org/isc/bind9/9.21.26", "url": "https://downloads.isc.org/isc/bind9/9.21.26" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2026-80274", "url": "https://kb.isc.org/docs/cve-2026-80274" } ], "release_date": "2026-09-16T14:07:20.058000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-11-04T08:13:24+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer 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"url": "https://access.redhat.com/errata/RHSA-2026:95048" }, { "category": "workaround", "details": "To mitigate this issue, disable DNSSEC validation in the BIND resolver configuration. This can be achieved by setting `dnssec-enable no;` and `dnssec-validation no;` within the `options` block in `named.conf` or an included configuration file. A restart of the `named` service is required for the changes to take effect and may impact DNS resolution during the restart. Disabling DNSSEC validation will reduce the security posture of DNS resolution by removing integrity protection for DNS data.", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.x86_64", 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"system_name": "Red Hat Bugzilla ID", "text": "2556407" } ], "notes": [ { "category": "description", "text": "A flaw was found in BIND. This vulnerability may allow a remote attacker to achieve arbitrary code execution on the target server. An attacker who captures a valid User Datagram Protocol (UDP) message signed with Generic Security Service Transaction Signature (GSS-TSIG) can replay it while the negotiated key is active. When combined with crafted queries directed to an attacker-controlled DNS zone, this triggers memory corruption in the named service.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat Product Security has rated this vulnerability as Important rather than Critical because, while remote unauthenticated code execution is possible, exploitation depends on capturing active cryptographic keys within their validity window and orchestrating complex concurrent requests. In standard Red Hat Enterprise Linux deployments, the BIND daemon does not enable GSS-TSIG by default, restricting risk primarily to servers integrated with Kerberos-based identity infrastructure like FreeIPA or Active Directory. Deployments that do not negotiate GSS-TSIG keys or that strictly limit dynamic DNS access to trusted networks remain unexposed to this attack vector.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", 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"category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-94300", "url": "https://www.cve.org/CVERecord?id=CVE-2026-94300" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-94300", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94300" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2026-94300", "url": "https://kb.isc.org/docs/cve-2026-94300" } ], "release_date": "2026-10-21T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-11-04T08:13:24+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", 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remove the `tkey-gssapi-keytab` and `tkey-gssapi-credential` directives within `/etc/named.conf` (and any referenced include files), then restart the service:\n\nsystemctl restart named\n\nIf operating named inside a chroot environment, execute:\n\nsystemctl restart named-chroot\n\nAlternatively, restrict UDP and TCP traffic on port 53 to trusted network segments using host or network firewalls to block untrusted external access.\n\nCaveats: Disabling GSS-TSIG prevents clients from performing Kerberos-authenticated dynamic DNS modifications, which may disrupt environments relying on automated Active Directory or Identity Management (IdM) enrollment.\nWarning: Restarting the BIND service will momentarily interrupt active DNS query processing and domain name resolution for dependent network clients.", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", 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A remote attacker can cause a Denial of Service (DoS) by sending requests that trigger an assertion failure, abruptly terminating the resolver daemon. This vulnerability occurs when the resolver is configured with both a redirect zone and strict query name minimization while processing redirected queries.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: bind: Denial of Service via assertion failure during redirect processing", "title": "Vulnerability summary" }, { "category": "other", "text": "This vulnerability is rated as Important because an unauthenticated remote attacker can trigger a denial of service by causing the named daemon to crash without prior privileges. Exploitation is restricted to recursive resolvers where administrators have explicitly configured redirect zones alongside strict query name minimization. Standard Red Hat Enterprise Linux installations do not employ these non-default settings out of the box, significantly limiting exposure on typical systems.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.s390x", 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"CRB-9.6.0.Z.EUS:bind-utils-debuginfo-32:9.16.23-31.el9_6.5.ppc64le", "CRB-9.6.0.Z.EUS:bind-utils-debuginfo-32:9.16.23-31.el9_6.5.s390x", "CRB-9.6.0.Z.EUS:bind-utils-debuginfo-32:9.16.23-31.el9_6.5.x86_64" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2556415" } ], "notes": [ { "category": "description", "text": "A flaw was found in BIND. A remote attacker can cause a denial of service (DoS) by sending a sequence of recursive and non-recursive queries to an affected server. When BIND is configured to handle recursive queries alongside multiple Response Policy Zones (RPZ) with differing recursion settings, processing these queries triggers an assertion failure. This failure causes the service to crash and terminate abruptly.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: bind: Denial of service via assertion failure in RPZ query processing", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat rates this vulnerability as Important because an unauthenticated remote attacker can crash the BIND name service, causing a denial of service for all dependent infrastructure. Exploitation requires a specific, non-default deployment where recursive queries are permitted alongside multiple response policy zones configured with conflicting recursive-only options. Default Red Hat Enterprise Linux configurations do not define response policy zones and are therefore not exposed unless administrators have explicitly implemented this combination of policies.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-dnssec-utils-32:9.16.23-31.el9_6.5.ppc64le", 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"https://access.redhat.com/security/cve/CVE-2026-97313" }, { "category": "external", "summary": "RHBZ#2556415", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556415" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-97313", "url": "https://www.cve.org/CVERecord?id=CVE-2026-97313" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-97313", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97313" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2026-97313", "url": "https://kb.isc.org/docs/cve-2026-97313" } ], "release_date": "2026-10-21T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-11-04T08:13:24+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", 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Zones (RPZ) configured in `/etc/named.conf` use identical `recursive-only` settings. For example, ensure all RPZ definitions consistently specify `recursive-only yes;` or `recursive-only no;`, eliminating conflicting policies.\n\nAlternatively, limit recursive query privileges strictly to authorized clients by configuring the `allow-recursion` option with an access control list (ACL).\n\nAfter modifying the configuration, validate the syntax and reload the service:\n\n```\nnamed-checkconf\nsystemctl reload named\n```\n\nCaveats:\nAligning the `recursive-only` setting across RPZ zones may alter policy enforcement behavior for non-recursive queries. Restricting recursion prevents unauthorized networks from performing recursive lookups.\n\nWarning:\nReloading or restarting the `named` service may cause a momentary pause in active DNS query processing.", "product_ids": [ "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.src", "AppStream-9.6.0.Z.EUS:bind-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.s390x", "AppStream-9.6.0.Z.EUS:bind-chroot-32:9.16.23-31.el9_6.5.x86_64", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.aarch64", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.ppc64le", "AppStream-9.6.0.Z.EUS:bind-debuginfo-32:9.16.23-31.el9_6.5.s390x", 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