{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97609", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.158Z", "datePublished": "2026-09-25T10:22:19.627Z", "dateUpdated": "2026-09-25T10:22:19.627Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T10:22:19.627Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nfnetlink_cttimeout.c"], "versions": [{"version": "ebfbe67568a734a449203097b02c4ab884257535", "lessThan": "a7fdd86c386b7f7cc72a126389c2cdb55d035221", "status": "affected", "versionType": "git"}, {"version": "ebfbe67568a734a449203097b02c4ab884257535", "lessThan": "1f69c570a73f2dedf75ea5166d47622d5fa958c1", "status": "affected", "versionType": "git"}, {"version": "ebfbe67568a734a449203097b02c4ab884257535", "lessThan": "fec9b1de0d02de8dafa3cc344bcb91cf28660643", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nfnetlink_cttimeout.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"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-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221"}, {"url": "https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1"}, {"url": "https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643"}], "title": "netfilter: cttimeout: prevent UAF during module unload", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nfnetlink_cttimeout.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a7fdd86c386b7f7cc72a126389c2cdb55d035221", "status": "affected", "version": "ebfbe67568a734a449203097b02c4ab884257535", "versionType": "git"}, {"lessThan": "1f69c570a73f2dedf75ea5166d47622d5fa958c1", "status": "affected", "version": "ebfbe67568a734a449203097b02c4ab884257535", "versionType": "git"}, {"lessThan": "fec9b1de0d02de8dafa3cc344bcb91cf28660643", "status": "affected", "version": "ebfbe67568a734a449203097b02c4ab884257535", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nfnetlink_cttimeout.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc3", "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\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."}], "id": "CVE-2026-97609", "lastModified": "2026-09-25T11:17:14.987", "metrics": {}, "published": "2026-09-25T11:17:14.987", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f69c570a73f2dedf75ea5166d47622d5fa958c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a7fdd86c386b7f7cc72a126389c2cdb55d035221"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fec9b1de0d02de8dafa3cc344bcb91cf28660643"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}