{ "cvss": 5.5, "datePublished": "2026-04-24T15:16:28.690", "dateUpdated": "2026-11-05T22:18:39.680", "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL deref in bond_debug_rlb_hash_show\n\nrlb_clear_slave intentionally keeps RLB hash-table entries on\nthe rx_hashtbl_used_head list with slave set to NULL when no\nreplacement slave is available. However, bond_debug_rlb_hash_show\nvisites client_info->slave without checking if it's NULL.\n\nOther used-list iterators in bond_alb.c already handle this NULL-slave\nstate safely:\n\n- rlb_update_client returns early on !client_info->slave\n- rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance\ncompare slave values before visiting\n- lb_req_update_subnet_clients continues if slave is NULL\n\nThe following NULL deref crash can be trigger in\nbond_debug_rlb_hash_show:\n\n[ 1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[ 1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41)\n[ 1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286\n[ 1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204\n[ 1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078\n[ 1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000\n[ 1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0\n[ 1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8\n[ 1.294864] FS: 0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000\n[ 1.295239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0\n[ 1.295897] Call Trace:\n[ 1.296134] seq_read_iter (fs/seq_file.c:231)\n[ 1.296341] seq_read (fs/seq_file.c:164)\n[ 1.296493] full_proxy_read (fs/debugfs/file.c:378 (discriminator 1))\n[ 1.296658] vfs_read (fs/read_write.c:572)\n[ 1.296981] ksys_read (fs/read_write.c:717)\n[ 1.297132] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n[ 1.297325] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd a NULL check and print \"(none)\" for entries with no assigned slave.", "id": "CVE-2026-31546", "raw": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "drivers/net/bonding/bond_debugfs.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "19f0fd87df0e5746b24f5caa465a66a8c6e6e241", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "edacf1613f7b26423ebfa8b2892e7453c4235354", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "2ec2c777f357a83c3d503d8d9370c90b60f0ae63", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "0a3f8cd3f370247ded14d38d216b49dd30eade76", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "017d674cf6930e9586a29ee808c7ca09d1396d07", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" }, { "lessThan": "605b52497bf89b3b154674deb135da98f916e390", "status": "affected", "version": "caafa84251b886feb6cdf23d50e2cc99dcdaaaf3", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "drivers/net/bonding/bond_debugfs.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "2.6.38" }, { "lessThan": "2.6.38", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.253", "versionType": "semver" }, { "lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.203", "versionType": "semver" }, { "lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.167", "versionType": "semver" }, { "lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.130", "versionType": "semver" }, { "lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.78", "versionType": "semver" }, { "lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.20", "versionType": "semver" }, { "lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.10", "versionType": "semver" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" }, { "affectedData": [ { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom" } ] }, { "defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [ { "lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom" } ] } ], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "04177CA2-7B3E-475B-ABB0-BBE8D2851FED", "versionEndExcluding": "5.10.253", "versionStartIncluding": "2.6.38.1", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.11", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2EDC6BAF-B710-4E26-B6AA-D68922EE7B43", "versionEndExcluding": "6.1.167", "versionStartIncluding": "5.16", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267", "versionEndExcluding": "6.6.130", "versionStartIncluding": "6.2", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "28D591F5-B196-4CC9-905C-DC80F116E7A8", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E5571059-6552-48E7-9BEF-3E358C387171", "versionEndExcluding": "6.18.20", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.19", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.38:-:*:*:*:*:*:*", "matchCriteriaId": "985DC743-744A-429F-8098-EFCC91DFB6F7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL deref in bond_debug_rlb_hash_show\n\nrlb_clear_slave intentionally keeps RLB hash-table entries on\nthe rx_hashtbl_used_head list with slave set to NULL when no\nreplacement slave is available. However, bond_debug_rlb_hash_show\nvisites client_info->slave without checking if it's NULL.\n\nOther used-list iterators in bond_alb.c already handle this NULL-slave\nstate safely:\n\n- rlb_update_client returns early on !client_info->slave\n- rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance\ncompare slave values before visiting\n- lb_req_update_subnet_clients continues if slave is NULL\n\nThe following NULL deref crash can be trigger in\nbond_debug_rlb_hash_show:\n\n[ 1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[ 1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41)\n[ 1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286\n[ 1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204\n[ 1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078\n[ 1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000\n[ 1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0\n[ 1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8\n[ 1.294864] FS: 0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000\n[ 1.295239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0\n[ 1.295897] Call Trace:\n[ 1.296134] seq_read_iter (fs/seq_file.c:231)\n[ 1.296341] seq_read (fs/seq_file.c:164)\n[ 1.296493] full_proxy_read (fs/debugfs/file.c:378 (discriminator 1))\n[ 1.296658] vfs_read (fs/read_write.c:572)\n[ 1.296981] ksys_read (fs/read_write.c:717)\n[ 1.297132] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n[ 1.297325] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd a NULL check and print \"(none)\" for entries with no assigned slave." } ], "id": "CVE-2026-31546", "lastModified": "2026-11-05T22:18:39.680", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2026-31546", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "partial" } ], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:38:27.031828Z", "version": "2.0.3" } } ] }, "published": "2026-04-24T15:16:28.690", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354" }, { "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html" }, { "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-476" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }, "severity": "MEDIUM", "source": "nvd", "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL deref in bond_debug_rlb_h..." }