{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46324", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.112Z", "datePublished": "2026-06-09T12:11:16.602Z", "dateUpdated": "2026-08-05T12:31:19.475Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:19.475Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_tables_api.c" ], "versions": [ { "version": "f9a43007d3f7ba76d5e7f9421094f00f2ef202f8", "lessThan": "0bd93ce4f3c35e845532184331d7917d7e562c80", "status": "affected", "versionType": "git" }, { "version": "f9a43007d3f7ba76d5e7f9421094f00f2ef202f8", "lessThan": "0f33e8ad6ac563ae2233dd7f75884e0ee010521d", "status": "affected", "versionType": "git" }, { "version": "f9a43007d3f7ba76d5e7f9421094f00f2ef202f8", "lessThan": "f3224ee463f8f6f6ced7dcdf6081add4f8128527", "status": "affected", "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", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.262", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.10.198", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.45", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "5.17.13", "lessThan": "5.18", "status": "affected", "versionType": "semver" }, { "version": "5.18.2", "lessThan": "5.19", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_tables_api.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.19", "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" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0bd93ce4f3c35e845532184331d7917d7e562c80" }, { "url": "https://git.kernel.org/stable/c/0f33e8ad6ac563ae2233dd7f75884e0ee010521d" }, { "url": "https://git.kernel.org/stable/c/f3224ee463f8f6f6ced7dcdf6081add4f8128527" } ], "title": "netfilter: nf_tables: use list_del_rcu for netlink hooks", "x_generator": { "engine": "bippy-1.2.0" } } } }