CVE-2026-63946

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.

References

• https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568
• https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
• https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878
• https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
• https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd