CVE-2026-74535

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/16d89a63e08280abeef7218970a3bbd7ca62b021
• https://git.kernel.org/stable/c/82e982f54f962f72646868ddbb2c3bd9ea178568
• https://git.kernel.org/stable/c/3c3d5f85db80145636bb991a6005e2760012b985
• https://git.kernel.org/stable/c/200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43

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