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.
References
Configurations
Configuration 1 (hide)
|
History
29 Jul 2026, 19:30
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-416 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/5ba9950bc9078e19b69cca1e56d1553b125c6857 - Patch | |
| References | () https://git.kernel.org/stable/c/6ce7ef41743740ce15c2061561b784148b565b3f - Patch | |
| References | () https://git.kernel.org/stable/c/7ddc29a094d96e9b3aa280433c6dc443df9eabf2 - Patch | |
| References | () https://git.kernel.org/stable/c/e77fbefd1269b5c123e7c651a1ebdce1b87d19a0 - Patch | |
| First Time |
Linux linux Kernel
Linux |
20 Jul 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
19 Jul 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-19 12:16
Updated : 2026-07-29 19:30
NVD link : CVE-2026-53389
Mitre link : CVE-2026-53389
CVE.ORG link : CVE-2026-53389
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free