Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 before 6ce7ef41743740ce15c2061561b784148b565b3f; affected d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 before e77fbefd1269b5c123e7c651a1ebdce1b87d19a0; affected d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 before 7ddc29a094d96e9b3aa280433c6dc443df9eabf2; affected d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 before 5ba9950bc9078e19b69cca1e56d1553b125c6857 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.12.95 through 6.12.*; unaffected 6.18.38 through 6.18.*; unaffected 7.1.3 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.