363 lines
18 KiB
JSON
363 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26809",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.179Z",
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"datePublished": "2024-04-04T09:51:51.245Z",
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"dateUpdated": "2026-08-05T11:27:28.080Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:27:28.080Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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\")."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nft_set_pipapo.c"
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],
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"versions": [
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{
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"version": "4a6430b99f67842617c7208ca55a411e903ba03a",
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"lessThan": "b36b83297ff4910dfc8705402c8abffd4bbf8144",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5ccecafc728b0df48263d5ac198220bcd79830bc",
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"lessThan": "362508506bf545e9ce18c72a2c48dcbfb891ab9c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e",
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"lessThan": "5ad233dc731ab64cdc47b84a5c1f78fff6c024af",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e",
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"lessThan": "ff90050771412b91e928093ccd8736ae680063c2",
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"status": "affected",
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},
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{
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"lessThan": "821e28d5b506e6a73ccc367ff792bd894050d48b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e",
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"lessThan": "9384b4d85c46ce839f51af01374062ce6318b2f2",
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"status": "affected",
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{
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"version": "9827a0e6e23bf43003cd3d5b7fb11baf59a35e1e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d2b18d110685ce46ca1633b8ec586c685e243a51",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.10.130",
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"lessThan": "5.10.214",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.54",
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"lessThan": "5.15.153",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.18.11",
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"lessThan": "5.19",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nft_set_pipapo.c"
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],
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"versions": [
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{
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"version": "5.19",
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"status": "affected"
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{
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"version": "0",
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"status": "unaffected",
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"lessThanOrEqual": "5.10.*",
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"version": "5.15.153",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.83",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.23",
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"lessThanOrEqual": "6.6.*",
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"version": "6.7.11",
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"status": "unaffected",
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{
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"version": "6.8.2",
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"lessThanOrEqual": "6.8.*",
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"versionType": "semver"
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "netfilter: nft_set_pipapo: release elements in clone only from destroy path",
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"x_generator": {
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"role": "CISA Coordinator",
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"options": [
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