CVE-2026-31408

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

Bluetooth: SCO: Fix use-after-free in scorecvframe() due to missing sock_hold

scorecvframe() reads conn->sk under scoconnlock() 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 (scosocktimeout(), scoconndel()) correctly use scosockhold() to safely hold a reference under the lock.

Fix by using scosockhold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.