{ "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": 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