Description
In the Linux kernel, the following vulnerability has been resolved: net/tcp-ao: fix use-after-free of key in del_async path In tcp_ao_delete_key(), the del_async path skips the current_key and rnext_key validity checks present in the synchronous path, assuming these pointers are always NULL on LISTEN sockets. However, if a key was added with set_current=1/set_rnext=1 while the socket was in CLOSE state, current_key and rnext_key will be non-NULL after listen() transitions the socket to LISTEN. When such a key is deleted with del_async=1, hlist_del_rcu() and call_rcu() free the key without clearing the dangling pointers. After the RCU grace period, getsockopt(TCP_AO_INFO) dereferences current_key->sndid and rnext_key->rcvid from freed slab memory. Clear current_key and rnext_key in the del_async path when they reference the key being deleted.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 to < 6ce7ef41743740ce15c2061561b784148b565b3faffectedd6732b95b6fbbc6d5bb9d2f809e275763640c4a2 to < e77fbefd1269b5c123e7c651a1ebdce1b87d19a0affectedd6732b95b6fbbc6d5bb9d2f809e275763640c4a2 to < 7ddc29a094d96e9b3aa280433c6dc443df9eabf2affectedd6732b95b6fbbc6d5bb9d2f809e275763640c4a2 to < 5ba9950bc9078e19b69cca1e56d1553b125c6857affected
Linux Linux
Default version status: affected
6.7affected0 to < 6.7unaffected6.12.95 to ≤ 6.12.*unaffected6.18.38 to ≤ 6.18.*unaffected7.1.3 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected