CVE-2026-74535

Bluetooth: ISO: avoid deadlocks in iso_sock_timeout

State: Published
Severity: 8.8 High
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a58d0f5dac322e16cc75334d000666512341bde5 to before 16d89a63e08280abeef7218970a3bbd7ca62b021Affected dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 82e982f54f962f72646868ddbb2c3bd9ea178568Affected dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 3c3d5f85db80145636bb991a6005e2760012b985Affected dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43Affected f53e7489273dc2bb307bf50f319b3762d45534f0Affected 6.12.2 to before 6.12.103Affected 6.11.11 to before 6.12Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.12.103 through 6.12.Not affected 6.18.44 through 6.18.Not affected 7.1.8 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

a58d0f5dac322e16cc75334d000666512341bde5 to before 16d89a63e08280abeef7218970a3bbd7ca62b021Affected
dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 82e982f54f962f72646868ddbb2c3bd9ea178568Affected
dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 3c3d5f85db80145636bb991a6005e2760012b985Affected
dc26097bdb864a0d5955b9a25e43376ffc1af99b to before 200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43Affected
f53e7489273dc2bb307bf50f319b3762d45534f0Affected
6.12.2 to before 6.12.103Affected
6.11.11 to before 6.12Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.12.103 through 6.12.*Not affected
6.18.44 through 6.18.*Not affected
7.1.8 through 7.1.*Not affected
7.2 and laterNot affected

References

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