CVE-2026-63946

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.