{"id":"CVE-2026-46324","state":"PUBLISHED","title":"netfilter: nf_tables: use list_del_rcu for netlink hooks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: use list_del_rcu for netlink hooks\n\nnft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks need\nto use list_del_rcu(), this list can be walked by concurrent dumpers.\n\nAdd a new helper and use it consistently.","publishedAt":"2026-06-09T12:11:16.602Z","updatedAt":"2026-10-30T12:26:17.369Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"6480ea533cedfbf79ea5a1f12c5f71d41484dd8a","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"2405730fde96f7fa483a5862e323b681e0e09f54","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"fe45e203527af8a2c0dc4c8a7b56c09c74b796c8","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"0bd93ce4f3c35e845532184331d7917d7e562c80","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"0f33e8ad6ac563ae2233dd7f75884e0ee010521d","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"f3224ee463f8f6f6ced7dcdf6081add4f8128527","versionType":"git"},{"version":"c73955a09408e7374d9abfd0e78ce3de9cda0635","status":"affected","versionType":"git"},{"version":"b09e6ccf0d12f9356e8e3508d3e3dce126298538","status":"affected","versionType":"git"},{"version":"3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82","status":"affected","versionType":"git"},{"version":"9c413a8c8bb49cc16796371805ecb260e885bb2b","status":"affected","versionType":"git"},{"version":"a3940dcf552f2393d1e8f263b386593f98abe829","status":"affected","versionType":"git"},{"version":"86c0154f4c3a56c5db8b9dd09e3ce885382c2c19","status":"affected","versionType":"git"},{"version":"4.19.316","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.262","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.198","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.45","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"5.17.13","status":"affected","lessThan":"5.18","versionType":"semver"},{"version":"5.18.2","status":"affected","lessThan":"5.19","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_tables_api.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","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":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_tables_api.c"]}],"references":["https://git.kernel.org/stable/c/6480ea533cedfbf79ea5a1f12c5f71d41484dd8a","https://git.kernel.org/stable/c/2405730fde96f7fa483a5862e323b681e0e09f54","https://git.kernel.org/stable/c/fe45e203527af8a2c0dc4c8a7b56c09c74b796c8","https://git.kernel.org/stable/c/0bd93ce4f3c35e845532184331d7917d7e562c80","https://git.kernel.org/stable/c/0f33e8ad6ac563ae2233dd7f75884e0ee010521d","https://git.kernel.org/stable/c/f3224ee463f8f6f6ced7dcdf6081add4f8128527"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-30T12:44:04.813Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46324.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46324","state":"PUBLISHED","datePublished":"2026-06-09T12:11:16.602Z","dateUpdated":"2026-10-30T12:26:17.369Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.112Z"},"containers":{"cna":{"title":"netfilter: nf_tables: use list_del_rcu for netlink hooks","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: use list_del_rcu for netlink hooks\n\nnft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks need\nto use list_del_rcu(), this list can be walked by concurrent dumpers.\n\nAdd a new helper and use it consistently."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"6480ea533cedfbf79ea5a1f12c5f71d41484dd8a","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"2405730fde96f7fa483a5862e323b681e0e09f54","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"fe45e203527af8a2c0dc4c8a7b56c09c74b796c8","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"0bd93ce4f3c35e845532184331d7917d7e562c80","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"0f33e8ad6ac563ae2233dd7f75884e0ee010521d","versionType":"git"},{"version":"f9a43007d3f7ba76d5e7f9421094f00f2ef202f8","status":"affected","lessThan":"f3224ee463f8f6f6ced7dcdf6081add4f8128527","versionType":"git"},{"version":"c73955a09408e7374d9abfd0e78ce3de9cda0635","status":"affected","versionType":"git"},{"version":"b09e6ccf0d12f9356e8e3508d3e3dce126298538","status":"affected","versionType":"git"},{"version":"3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82","status":"affected","versionType":"git"},{"version":"9c413a8c8bb49cc16796371805ecb260e885bb2b","status":"affected","versionType":"git"},{"version":"a3940dcf552f2393d1e8f263b386593f98abe829","status":"affected","versionType":"git"},{"version":"86c0154f4c3a56c5db8b9dd09e3ce885382c2c19","status":"affected","versionType":"git"},{"version":"4.19.316","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.262","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.198","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.45","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"5.17.13","status":"affected","lessThan":"5.18","versionType":"semver"},{"version":"5.18.2","status":"affected","lessThan":"5.19","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_tables_api.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","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":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_tables_api.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6480ea533cedfbf79ea5a1f12c5f71d41484dd8a"},{"url":"https://git.kernel.org/stable/c/2405730fde96f7fa483a5862e323b681e0e09f54"},{"url":"https://git.kernel.org/stable/c/fe45e203527af8a2c0dc4c8a7b56c09c74b796c8"},{"url":"https://git.kernel.org/stable/c/0bd93ce4f3c35e845532184331d7917d7e562c80"},{"url":"https://git.kernel.org/stable/c/0f33e8ad6ac563ae2233dd7f75884e0ee010521d"},{"url":"https://git.kernel.org/stable/c/f3224ee463f8f6f6ced7dcdf6081add4f8128527"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in nf_tables netdev hook teardown reached only via Netfilter netlink (nft) syscalls—chain/flowtable updates, dumps, netns teardown, and netlink socket release—not from remote packet handling alone. Per kernel guidance, nftables/netfilter is Local (L).\nAC:L - Exploitation is a race between hook-list removal (`list_del()` + RCU free) and concurrent RCU walkers (`nft_dump_basechain_hook_list`, flowtable dump, or packet-path `list_for_each_entry_rcu`). An attacker with CAP_NET_ADMIN can drive both sides concurrently (e.g., one thread dumping chains/flowtables while another deletes hooks or tears down the netns).\nPR:L - All nf_tables netlink operations are gated by `netlink_net_capable(skb, CAP_NET_ADMIN)` in `nfnetlink_rcv()`. CAP_NET_ADMIN is obtainable by an unprivileged user via user+network namespaces (`unshare -Urn`), not real init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers hook teardown and concurrent dumps or traffic entirely through their own netlink sockets and namespace lifecycle.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries.\nC:H - Using `list_del()` instead of `list_del_rcu()` on lists walked under `rcu_read_lock()` is a use-after-free/list-corruption bug; concurrent dumpers dereference `nft_hook` fields (e.g., `ifname`) after unlink/free, enabling arbitrary kernel memory read via heap grooming.\nI:H - The freed `nft_hook` kmalloc object can be reallocated and corrupted through the dangling RCU list pointers, providing a standard kernel UAF primitive exploitable for arbitrary write and control-flow hijacking.\nA:H - The race reliably causes kernel list corruption and use-after-free, leading to oops/panic during hook dumps, flowtable lookups, or netns cleanup; UAF in this path has inherent high availability impact even when not fully weaponized."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:26:17.369Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.262"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-46324","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:22:09.898894Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:36:58.611Z"}}]}}}