{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26642", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.137Z", "datePublished": "2024-03-21T10:43:43.495Z", "dateUpdated": "2026-08-05T11:26:30.075Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:30.075Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: disallow anonymous set with timeout flag\n\nAnonymous sets are never used with timeout from userspace, reject this.\nException to this rule is NFT_SET_EVAL to ensure legacy meters still work." } ], "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 vulnerable configuration is created and destroyed through the nfnetlink/nf_tables netlink interface (NFT_MSG_NEWSET/NEWSETELEM/DELRULE), which requires a local socket on the system. Netfilter/nftables control plane is explicitly a local attack vector.\nAC:L - The attacker controls both sides of the race: they choose the per-element timeout (driving when the 1 s-interval async rhash GC worker collects elements) and issue the rule-delete/abort transaction that frees the anonymous set, and can retry the loop indefinitely until the batched GC work lands after `nft_rhash_destroy()`.\nPR:L - `nfnetlink_rcv()` requires only CAP_NET_ADMIN over the network namespace, which any unprivileged user obtains via `unshare -Urn`; nftables is fully functional per-netns, so a basic local user suffices.\nUI:N - The entire sequence — creating the table/chain/rule with the inline anonymous timeout set, adding expiring elements, and deleting the binding rule — is performed by the attacker's own process with no victim action.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale GC batch reads freed `nft_rhash_elem` memory (keys hashed by `rhashtable_remove_fast()`, extension data dereferenced by `nft_setelem_data_deactivate()`), which the attacker can reallocate and spray, yielding a kernel-memory disclosure primitive and leaking kernel pointers.\nI:H - `nft_setelem_remove()` performs rhashtable unlink writes into a freed bucket table and freed nodes, `nft_use_dec()` decrements refcounts inside reallocated objects, and the elements are later destroyed a second time — a write/decrement/double-free primitive of the class routinely leveraged for nftables local privilege escalation.\nA:H - Operating on freed elements and a destroyed rhashtable reliably produces slab corruption, refcount underflow warnings, and kernel oops/panic, and the attacker can trigger it repeatedly." } ] } ], "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": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "e4988d8415bd0294d6f9f4a1e7095f8b50a97ca9", "status": "affected", "versionType": "git" }, { "version": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "e9a0d3f376eb356d54ffce36e7cc37514cbfbd6f", "status": "affected", "versionType": "git" }, { "version": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "fe40ffbca19dc70d7c6b1e3c77b9ccb404c57351", "status": "affected", "versionType": "git" }, { "version": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "7cdc1be24cc1bcd56a3e89ac4aef20e31ad09199", "status": "affected", "versionType": "git" }, { "version": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "72c1efe3f247a581667b7d368fff3bd9a03cd57a", "status": "affected", "versionType": "git" }, { "version": "761da2935d6e18d178582dbdf315a3a458555505", "lessThan": "c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12", "status": "affected", "versionType": "git" 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