{"id":"CVE-2026-97609","aliases":[],"cve":{"records":[{"id":"CVE-2026-97609","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-24T16:01:01.158Z","published":"2026-09-25T10:22:19.627Z","modified":"2026-10-30T12:37:36.059Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:37:36.059Z"}],"references":[{"url":"https://git.kernel.org/stable/c/763787e9d43982d1082b59caeabd317343b153ea","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f664e06699829a31e95675a6864655a6c5f9904f","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/73f353bec62509c776184e49a031c6145cec0d05","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"netfilter: cttimeout: prevent UAF during module unload","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: cttimeout: prevent UAF during module unload\n\nnf_ct_set_timeout() protects the timeout hook dereference and policy lookup\nwith rcu_read_lock(). cttimeout_exit(), however, unregisters the per-net\noperations before it clears the hook.\n\nThis allows the following interleaving:\n\n  CPU 0                              CPU 1\n  cttimeout_exit()                   nf_ct_set_timeout()\n    unregister_pernet_subsys()         rcu_read_lock()\n      kfree(pernet)                     h = nf_ct_timeout_hook\n                                        h->timeout_find_get()\n                                          nfct_timeout_pernet()\n\nThe hook still points to ctnl_timeout_find_get() when CPU 1 looks up the\nalready freed per-net timeout list. KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in ctnl_timeout_find_get\n  Read of size 8 by task poc/90\n  Call Trace:\n   ctnl_timeout_find_get+0x271/0x2a0 [nfnetlink_cttimeout]\n   nf_ct_set_timeout+0x7b/0x3c0\n   xt_ct_tg_check+0x724/0xb20\n   xt_check_target+0x234/0xa90\n   do_ipt_set_ctl+0x570/0x1270\n  Allocated by task 89:\n   __kmalloc_noprof+0x16e/0x460\n   ops_init+0x6d/0x420\n   register_pernet_operations+0x2f6/0x670\n  Freed by task 91:\n   kfree+0x131/0x390\n   ops_undo_list+0x3d4/0x730\n   unregister_pernet_operations+0x232/0x490\n   unregister_pernet_subsys+0x1c/0x30\n   cttimeout_exit+0x52/0x970 [nfnetlink_cttimeout]\n\nClear the hook and wait for existing readers before unregistering the\nper-net operations. This blocks new policy lookups and ensures readers that\nobserved the hook finish before the per-net storage is freed.","score":7,"severity":"high","published":"2026-09-25T10:22:19.627Z","modified":"2026-10-30T12:37:36.059Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"763787e9d43982d1082b59caeabd317343b153ea","versionType":"git"},{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"f664e06699829a31e95675a6864655a6c5f9904f","versionType":"git"},{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"73f353bec62509c776184e49a031c6145cec0d05","versionType":"git"},{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"a7fdd86c386b7f7cc72a126389c2cdb55d035221","versionType":"git"},{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"1f69c570a73f2dedf75ea5166d47622d5fa958c1","versionType":"git"},{"version":"ebfbe67568a734a449203097b02c4ab884257535","status":"affected","lessThan":"fec9b1de0d02de8dafa3cc344bcb91cf28660643","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-97609"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-97609"}],"remediation":[],"references":["https://git.kernel.org/stable/c/763787e9d43982d1082b59caeabd317343b153ea","https://git.kernel.org/stable/c/f664e06699829a31e95675a6864655a6c5f9904f","https://git.kernel.org/stable/c/73f353bec62509c776184e49a031c6145cec0d05","https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221","https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1","https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643"],"sources":[{"name":"CVE","id":"CVE-2026-97609","modified":"2026-10-30T12:37:36.059Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-97609"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7}],"sourceAffected":[],"observedAt":"2026-10-30T14:00:31.152Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:10:33.488Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"The Linux kernel's netfilter cttimeout module has a use-after-free vulnerability, affecting versions starting from 5.13. An attacker with access to the module can potentially exploit this weakness, but the impact is unclear.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T14:26:37.145Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-97609"}]}}