{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26809","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.179Z","datePublished":"2024-04-04T09:51:51.245Z","dateUpdated":"2026-08-05T11:27:28.080Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:27:28.080Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: release elements in clone only from destroy path\n\nClone already always provides a current view of the lookup table, use it\nto destroy the set, otherwise it is possible to destroy elements twice.\n\nThis fix requires:\n\n 212ed75dc5fb (\"netfilter: nf_tables: integrate pipapo into commit protocol\")\n\nwhich came after:\n\n 9827a0e6e23b (\"netfilter: nft_set_pipapo: release elements in clone from abort path\")."}],"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 vulnerability is reached exclusively through the nfnetlink/nftables netlink socket (NFNL_SUBSYS_NFTABLES batch transactions), which requires local system access. There is no network-facing path into the pipapo set destroy code.\nAC:L - The double free is fully deterministic — a single netlink batch that modifies elements of a pipapo set and deletes that set in the same transaction leaves priv->dirty set (nft_set_commit_update skips dead sets), guaranteeing elements are destroyed from both priv->match and priv->clone. No race, no memory-layout precondition beyond ordinary attacker-controlled heap grooming.\nPR:L - nfnetlink_rcv_batch() checks netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the socket's network-namespace user namespace, so an unprivileged local user obtains it via unshare -Urn and can create tables, pipapo sets and elements freely. pipapo is compiled unconditionally into nf_tables and is the default backend for concatenated-range sets.\nUI:N - The attacker triggers the entire sequence themselves with one nftables transaction batch from their own process. No victim action or interaction of any kind is needed.\nS:U - The corruption occurs in kernel slab memory and is exploited to gain kernel privileges within the same security authority. No hypervisor, IOMMU, or other security-boundary crossing is involved.\nC:H - The double free of the element allocation yields a dangling reference to a reallocated slab object, letting the attacker read back kernel data (including data reclaimed into the same kmalloc-cg cache) and ultimately obtain an arbitrary-read primitive.\nI:H - A controlled double free of an attacker-sized, attacker-content object is a strong exploitation primitive: reclaiming the freed chunk with a second live allocation gives type confusion and an arbitrary-write path, compounded by the duplicated nft_set_elem_expr_destroy() dropping set/object reference counts twice and causing refcount underflow.\nA:H - Even without full exploitation, freeing the same nft_pipapo_elem twice corrupts slab freelists and double-destroys element expressions, producing immediate kernel oops/panic (or KASAN double-free BUG). The attacker can trigger it repeatedly and at will."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nft_set_pipapo.c"],"versions":[{"version":"4a6430b99f67842617c7208ca55a411e903ba03a","lessThan":"b36b83297ff4910dfc8705402c8abffd4bbf8144","status":"affected","versionType":"git"},{"version":"5ccecafc728b0df48263d5ac198220bcd79830bc","lessThan":"362508506bf545e9ce18c72a2c48dcbfb891ab9c","status":"affected","versionType":"git"},{"version":"9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e","lessThan":"5ad233dc731ab64cdc47b84a5c1f78fff6c024af","status":"affected","versionType":"git"},{"version":"9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e","lessThan":"ff90050771412b91e928093ccd8736ae680063c2","status":"affected","versionType":"git"},{"version":"9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e","lessThan":"821e28d5b506e6a73ccc367ff792bd894050d48b","status":"affected","versionType":"git"},{"version":"9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e","lessThan":"9384b4d85c46ce839f51af01374062ce6318b2f2","status":"affected","versionType":"git"},{"version":"9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e","lessThan":"b0e256f3dd2ba6532f37c5c22e07cb07a36031ee","status":"affected","versionType":"git"},{"version":"d2b18d110685ce46ca1633b8ec586c685e243a51","status":"affected","versionType":"git"},{"version":"5.10.130","lessThan":"5.10.214","status":"affected","versionType":"semver"},{"version":"5.15.54","lessThan":"5.15.153","status":"affected","versionType":"semver"},{"version":"5.18.11","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/nft_set_pipapo.c"],"versions":[{"version":"5.19","status":"affected"},{"version":"0","lessThan":"5.19","status":"unaffected","versionType":"semver"},{"version":"5.10.214","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.153","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.83","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.23","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.11","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8.2","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"5.10.130","versionEndExcluding":"5.10.214"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.54","versionEndExcluding":"5.15.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.7.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.8.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b36b83297ff4910dfc8705402c8abffd4bbf8144"},{"url":"https://git.kernel.org/stable/c/362508506bf545e9ce18c72a2c48dcbfb891ab9c"},{"url":"https://git.kernel.org/stable/c/5ad233dc731ab64cdc47b84a5c1f78fff6c024af"},{"url":"https://git.kernel.org/stable/c/ff90050771412b91e928093ccd8736ae680063c2"},{"url":"https://git.kernel.org/stable/c/821e28d5b506e6a73ccc367ff792bd894050d48b"},{"url":"https://git.kernel.org/stable/c/9384b4d85c46ce839f51af01374062ce6318b2f2"},{"url":"https://git.kernel.org/stable/c/b0e256f3dd2ba6532f37c5c22e07cb07a36031ee"}],"title":"netfilter: 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