{"cvss":9.8,"datePublished":"2026-08-04T07:16:31.340","dateUpdated":"2026-11-03T18:15:39.353","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n    [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport.","id":"CVE-2026-64564","raw":{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sctp/sm_make_chunk.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"a63afa1f9b12d5293cbe0b77fd45dc0632533a13","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"2b324ba3494ae958cba16a453e3e71489b4de7fc","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"fedeb4468987bcaff85fe3061de5ae052d414740","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"74e8f3e7114f0e26d1b2c4c048044db9fcc27603","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"85aca407c560aba81b5ce9d3d6cf94c74077d19b","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"d136b29bf91dd8e3161281b87de597b7311d9462","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"},{"lessThan":"9b2854f86f0b56e9027d68e7a3fc909d1a9b566f","status":"affected","version":"42e30bf3463cd37d73839376662cb79b4d5c416c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sctp/sm_make_chunk.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.25"},{"lessThan":"2.6.25","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n    [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport."}],"id":"CVE-2026-64564","lastModified":"2026-11-03T18:15:39.353","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":3.9,"impactScore":5.9,"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-64564","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","timestamp":"2026-10-16T15:42:57.454548Z","version":"2.0.3"}}]},"published":"2026-08-04T07:16:31.340","references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","url":"https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/06/13"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/06/3"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/06/4"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/07/1"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/07/2"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"http://www.openwall.com/lists/oss-security/2026/08/07/8"}],"sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","vulnStatus":"Awaiting Analysis","weaknesses":[{"description":[{"lang":"en","value":"CWE-416"}],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary"}]},"severity":"CRITICAL","source":"nvd","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in D..."}