Bluetooth: ISO: avoid deadlocks in iso_sock_timeout

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.

Timeline

1. Aug 15, 2026, 12:27 PM UTCCVE published
2. Oct 16, 2026, 6:59 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 7:05 PM UTCRecord last updated

Affected versions

• Linux Linux

  From a58d0f5dac322e16cc75334d000666512341bde5 · fixed in 16d89a63e08280abeef7218970a3bbd7ca62b021; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in 82e982f54f962f72646868ddbb2c3bd9ea178568; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in 3c3d5f85db80145636bb991a6005e2760012b985; From dc26097bdb864a0d5955b9a25e43376ffc1af99b · fixed in 200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43; From 6.12.2 · fixed in 6.12.103; From 6.11.11 · fixed in 6.12

• Linux Linux

  6.13

• KernelLinux

  fixed in 6.12.103; From 6.13.0 · fixed in 6.18.44; fixed in 7.1.8

References 4