CVE-2026-74535

/// Technical description

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

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout

iso_sock_timeout() takes lock_sock, so sync disabling the timer while

holding that lock may deadlock.

iso_sock_timeout() may also run concurrently with iso_conn_del(), which

leads to UAF

[Task 1] [Task hdev->workqueue]

iso_sock_timeout iso_conn_del

iso_conn_hold_unless_zero iso_chan_del

`------------> iso_conn_put

caller frees hcon

iso_conn_put

iso_conn_free

conn->hcon->iso_data = NULL; /* UAF */

Fix the deadlock by removing the disable from the lock_sock sections.

Move the timer from iso_conn to iso_pinfo to decouple it from iso_conn

which may need to be freed in lock_sock section. Convert some of the

clear_timer to disable_timer.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References