CVE-2025-38471

In the Linux kernel, the following vulnerability has been resolved:

tls: always refresh the queue when reading sock

After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry.

BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls]
(net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544)
Read of size 4 at addr ffff888013085750 by task tls/13529

CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme
Call Trace:
 kasan_report+0xca/0x100
 tls_strp_check_rcv+0x898/0x9a0 [tls]
 tls_rx_rec_wait+0x2c9/0x8d0 [tls]
 tls_sw_recvmsg+0x40f/0x1aa0 [tls]
 inet_recvmsg+0x1c3/0x1f0

Always reload the queue, fast path is to have the record in the queue when we wake, anyway (IOW the path going down if !strp->stm.full_len).

Affected Software

References

• https://git.kernel.org/stable/c/1f3a429c21e0e43e8b8c55d30701e91411a4df02
• https://git.kernel.org/stable/c/4ab26bce3969f8fd925fe6f6f551e4d1a508c68b
• https://git.kernel.org/stable/c/730fed2ff5e259495712518e18d9f521f61972bb
• https://git.kernel.org/stable/c/c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6
• https://git.kernel.org/stable/c/cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8