{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26643", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.137Z", "datePublished": "2024-03-21T10:43:44.103Z", "dateUpdated": "2026-08-05T11:26:31.217Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:31.217Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout\n\nWhile the rhashtable set gc runs asynchronously, a race allows it to\ncollect elements from anonymous sets with timeouts while it is being\nreleased from the commit path.\n\nMingi Cho originally reported this issue in a different path in 6.1.x\nwith a pipapo set with low timeouts which is not possible upstream since\n7395dfacfff6 (\"netfilter: nf_tables: use timestamp to check for set\nelement timeout\").\n\nFix this by setting on the dead flag for anonymous sets to skip async gc\nin this case.\n\nAccording to 08e4c8c5919f (\"netfilter: nf_tables: mark newset as dead on\ntransaction abort\"), Florian plans to accelerate abort path by releasing\nobjects via workqueue, therefore, this sets on the dead flag for abort\npath too." } ], "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 through the nfnetlink/nftables netlink socket interface (NFNL_SUBSYS_NFTABLES batch transactions) plus locally generated packets traversing the attacker's own chain, requiring local system access. Per kernel scoring guidance, netfilter/nftables netlink paths are Local.\nAC:L - The attacker controls both sides of the race: they create the anonymous meter set, choose the element timeouts that drive the async rhashtable GC worker (which fires every HZ since anonymous sets force gc_int=0), and choose exactly when to issue the rule-delete transaction that unbinds and asynchronously destroys the set. Failed attempts are harmless and the sequence can be repeated indefinitely with many parallel meter sets, so the race is reliably winnable.\nPR:L - The nftables netlink path only checks netlink_net_capable(skb, CAP_NET_ADMIN), which is evaluated against the owning user namespace of the network namespace, so an unprivileged user obtains it with `unshare -Urn` and nf_tables is fully per-netns. No real root in the initial namespace is needed.\nUI:N - The entire sequence — creating the meter rule, generating traffic to populate the set, and deleting the rule — is performed by the attacker's own process. No victim action of any kind is involved.\nS:U - The use-after-free and double-free occur in kernel heap memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is a standard kernel-local privilege escalation primitive.\nC:H - The freed nft_rhash_elem objects carry attacker-sized and attacker-controlled key/data, so the UAF permits reallocating the freed slab object with adjacent kernel data and reading it back through set-element dumps (NFT_MSG_GETSETELEM), yielding arbitrary kernel memory disclosure. Per guidance, any use-after-free is scored High.\nI:H - The concurrent GC removal and rhashtable_free_and_destroy() teardown produce a use-after-free and double-free of slab objects whose size and contents the attacker chooses, a well-established nftables heap-corruption primitive (as in CVE-2023-32233 and CVE-2024-1086) that can be groomed into an arbitrary write and full local privilege escalation.\nA:H - Even without successful exploitation, the UAF/double-free on set elements and the destroyed rhashtable bucket table causes slab corruption, list corruption, and kernel oops/panic. Any kernel crash is scored High." } ] } ], "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": "8da1b048f9a501d3d7d38c188ba09d7d0d5b8c27", "lessThan": "d75a589bb92af1abf3b779cfcd1977ca11b27033", "status": "affected", "versionType": "git" }, { "version": "bbdb3b65aa91aa0a32b212f27780b28987f2d94f", "lessThan": "edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf", "status": "affected", "versionType": "git" }, { "version": "448be0774882f95a74fa5eb7519761152add601b", "lessThan": "e2d45f467096e931044f0ab7634499879d851a5c", "status": "affected", "versionType": "git" }, { "version": "d19e8bf3ea4114dd21fc35da21f398203d7f7df1", "lessThan": "291cca35818bd52a407bc37ab45a15816039e363", "status": "affected", "versionType": "git" }, { "version": "ea3eb9f2192e4fc33b795673e56c97a21987f868", "lessThan": "406b0241d0eb598a0b330ab20ae325537d8d8163", "status": "affected", "versionType": "git" }, { "version": "5f68718b34a531a556f2f50300ead2862278da26", "lessThan": "b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1", "status": "affected", "versionType": "git" }, { "version": "5f68718b34a531a556f2f50300ead2862278da26", "lessThan": "5224afbc30c3ca9ba23e752f0f138729b2c48dd8", "status": "affected", "versionType": "git" }, { "version": "5f68718b34a531a556f2f50300ead2862278da26", "lessThan": "552705a3650bbf46a22b1adedc1b04181490fc36", "status": "affected", "versionType": "git" }, { "version": "0624f190b5742a1527cd938295caa8dc5281d4cd", "status": "affected", "versionType": "git" }, { "version": "5.4.262", "lessThan": "5.4.274", "status": "affected", "versionType": "semver" }, { "version": "5.10.198", "lessThan": "5.10.215", "status": "affected", "versionType": "semver" }, { "version": "5.15.134", "lessThan": "5.15.154", "status": "affected", "versionType": "semver" }, { "version": "6.1.56", "lessThan": "6.1.84", "status": "affected", "versionType": "semver" }, { "version": "6.4.11", "lessThan": "6.5", "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": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.274", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.215", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.154", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.84", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.4.262", "versionEndExcluding": "5.4.274" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.198", "versionEndExcluding": "5.10.215" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.134", "versionEndExcluding": "5.15.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.56", "versionEndExcluding": "6.1.84" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.7.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033" }, { "url": "https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf" }, { "url": "https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c" }, { "url": "https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363" }, { "url": "https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163" }, { "url": 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