CVE-2026-64572
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: free fib_alias with kfree_rcu() on insert error path fib_table_insert() publishes new_fa into the leaf's fa_list with fib_insert_alias() before calling the fib entry notifiers. When a notifier fails, the error path removes new_fa with fib_remove_alias() (hlist_del_rcu) and frees it right away with kmem_cache_free(). fib_table_lookup() walks that list under rcu_read_lock() only, so a concurrent lookup that already reached new_fa keeps reading it after the free: BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601) Read of size 1 at addr ffff88810676d4eb by task exploit/297 Call Trace: fib_table_lookup (net/ipv4/fib_trie.c:1601) ip_route_output_key_hash_rcu (net/ipv4/route.c:2814) ip_route_output_key_hash (net/ipv4/route.c:2705) __ip4_datagram_connect (net/ipv4/datagram.c:49) udp_connect (net/ipv4/udp.c:2144) __sys_connect (net/socket.c:2167) __x64_sys_connect (net/socket.c:2173) do_syscall_64 entry_SYSCALL_64_after_hwframe which belongs to the cache ip_fib_alias of size 56 Triggering the error path needs CAP_NET_ADMIN and a registered fib notifier that can reject a route; a netdevsim device whose IPv4 FIB resource is exhausted is enough. Free new_fa with alias_free_mem_rcu(), as fib_table_delete() already does for a fib_alias removed from the trie.
How to fix
- Linux Linux9d0778571def598c31e84a38ae5a7ebc6f65e6d8, bb03350f974aec352b660d032a1d283eb462165a, 6429c9cfd941e62acd7bb0bc64d631574d4c3b2a, 8150b5365f026e72250cacc527ea00be30f40105, d007056868723de9c0cc3f5ffaad47a8d468b9a4, cb8be318b4432abd88d3172ec157330f27a5f7a7, b8d2ea75c76abcd0d72679c2f488271f573e32fb, f2f152e94a67bc746afaf05a1b2702c195553112 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < 9d0778571def598c31e84a38ae5a7ebc6f65e6d8, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < bb03350f974aec352b660d032a1d283eb462165a, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < 6429c9cfd941e62acd7bb0bc64d631574d4c3b2a, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < 8150b5365f026e72250cacc527ea00be30f40105, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < d007056868723de9c0cc3f5ffaad47a8d468b9a4, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < cb8be318b4432abd88d3172ec157330f27a5f7a7, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < b8d2ea75c76abcd0d72679c2f488271f573e32fb, a6c76c17df021b141b0d306828c9fe4ba2d2717c ≤ v < f2f152e94a67bc746afaf05a1b2702c195553112, 5.6 | 9d0778571def598c31e84a38ae5a7ebc6f65e6d8, bb03350f974aec352b660d032a1d283eb462165a, 6429c9cfd941e62acd7bb0bc64d631574d4c3b2a, 8150b5365f026e72250cacc527ea00be30f40105, d007056868723de9c0cc3f5ffaad47a8d468b9a4, cb8be318b4432abd88d3172ec157330f27a5f7a7, b8d2ea75c76abcd0d72679c2f488271f573e32fb, f2f152e94a67bc746afaf05a1b2702c195553112 |
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