CVE-2026-74535 is a vulnerability in Linux Kernel
Published on August 15, 2026
Bluetooth: ISO: avoid deadlocks in iso_sock_timeout
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.
Products Associated with CVE-2026-74535
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Affected Versions
Linux:- Version a58d0f5dac322e16cc75334d000666512341bde5 and below 16d89a63e08280abeef7218970a3bbd7ca62b021 is affected.
- Version dc26097bdb864a0d5955b9a25e43376ffc1af99b and below 82e982f54f962f72646868ddbb2c3bd9ea178568 is affected.
- Version dc26097bdb864a0d5955b9a25e43376ffc1af99b and below 3c3d5f85db80145636bb991a6005e2760012b985 is affected.
- Version dc26097bdb864a0d5955b9a25e43376ffc1af99b and below 200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43 is affected.
- Version f53e7489273dc2bb307bf50f319b3762d45534f0 is affected.
- Version 6.12.2 and below 6.12.103 is affected.
- Version 6.11.11 and below 6.12 is affected.
- Version 6.13 is affected.
- Before 6.13 is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2-rc6, <= * is unaffected.