{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64572", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.797Z", "datePublished": "2026-08-05T08:08:09.068Z", "dateUpdated": "2026-08-19T16:28:49.541Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:49.541Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: free fib_alias with kfree_rcu() on insert error path\n\nfib_table_insert() publishes new_fa into the leaf's fa_list with\nfib_insert_alias() before calling the fib entry notifiers. When a\nnotifier fails, the error path removes new_fa with fib_remove_alias()\n(hlist_del_rcu) and frees it right away with kmem_cache_free().\n\nfib_table_lookup() walks that list under rcu_read_lock() only, so a\nconcurrent lookup that already reached new_fa keeps reading it after the\nfree:\n\n BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601)\n Read of size 1 at addr ffff88810676d4eb by task exploit/297\n Call Trace:\n fib_table_lookup (net/ipv4/fib_trie.c:1601)\n ip_route_output_key_hash_rcu (net/ipv4/route.c:2814)\n ip_route_output_key_hash (net/ipv4/route.c:2705)\n __ip4_datagram_connect (net/ipv4/datagram.c:49)\n udp_connect (net/ipv4/udp.c:2144)\n __sys_connect (net/socket.c:2167)\n __x64_sys_connect (net/socket.c:2173)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n which belongs to the cache ip_fib_alias of size 56\n\nTriggering the error path needs CAP_NET_ADMIN and a registered fib\nnotifier that can reject a route; a netdevsim device whose IPv4 FIB\nresource is exhausted is enough.\n\nFree new_fa with alias_free_mem_rcu(), as fib_table_delete() already\ndoes for a fib_alias removed from the trie." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/fib_trie.c" ], "versions": [ { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "9d0778571def598c31e84a38ae5a7ebc6f65e6d8", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "bb03350f974aec352b660d032a1d283eb462165a", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "6429c9cfd941e62acd7bb0bc64d631574d4c3b2a", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "8150b5365f026e72250cacc527ea00be30f40105", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "d007056868723de9c0cc3f5ffaad47a8d468b9a4", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "cb8be318b4432abd88d3172ec157330f27a5f7a7", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "b8d2ea75c76abcd0d72679c2f488271f573e32fb", "status": "affected", "versionType": "git" }, { "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "f2f152e94a67bc746afaf05a1b2702c195553112", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/fib_trie.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.6", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9d0778571def598c31e84a38ae5a7ebc6f65e6d8" }, { "url": "https://git.kernel.org/stable/c/bb03350f974aec352b660d032a1d283eb462165a" }, { "url": "https://git.kernel.org/stable/c/6429c9cfd941e62acd7bb0bc64d631574d4c3b2a" }, { "url": "https://git.kernel.org/stable/c/8150b5365f026e72250cacc527ea00be30f40105" }, { "url": "https://git.kernel.org/stable/c/d007056868723de9c0cc3f5ffaad47a8d468b9a4" }, { "url": "https://git.kernel.org/stable/c/cb8be318b4432abd88d3172ec157330f27a5f7a7" }, { "url": "https://git.kernel.org/stable/c/b8d2ea75c76abcd0d72679c2f488271f573e32fb" }, { "url": "https://git.kernel.org/stable/c/f2f152e94a67bc746afaf05a1b2702c195553112" } ], "title": "ipv4: fib: free fib_alias with kfree_rcu() on insert error path", "x_generator": { "engine": "bippy-1.2.0" } } } }