CVE-2026-31408Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d
• https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2
• https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de
• https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1
• https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3
• https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e
• https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361
• https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b