CVE-2026-53358

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

Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()

l2cap_chan_close() removes the channel from conn->chan_l, which

must be done under conn->lock. cleanup_listen() runs under the

parent sk_lock, so acquiring conn->lock would invert the

established conn->lock -> chan->lock -> sk_lock order.

Instead of calling l2cap_chan_close() directly, schedule

l2cap_chan_timeout with delay 0 to close the channel

asynchronously. The timeout handler already acquires conn->lock

and chan->lock in the correct order.

The timer is only armed when chan->conn is still set: if it is

already NULL, l2cap_conn_del() has already processed this channel

(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),

so there is nothing left to do. If l2cap_conn_del() races in

after the timer is armed, __clear_chan_timer() inside

l2cap_chan_del() cancels it; if the timer has already fired, the

handler returns harmlessly because chan->conn was cleared.