{"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"}}}}