CVE-2022-49555: Bluetooth: hci_qca: Use del_timer_sync() before freeing

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_qca: Use del_timer_sync() before freeing While looking at a crash report on a timer list being corrupted, which usually happens when a timer is freed while still active. This is commonly triggered by code calling del_timer() instead of del_timer_sync() just before freeing. One possible culprit is the hci_qca driver, which does exactly that. Eric mentioned that wake_retrans_timer could be rearmed via the work queue, so also move the destruction of the work queue before del_timer_sync().

Affected products

Linux kernel: from 4.3 before 5.10.120; from 5.11 before 5.15.45; from 5.16 before 5.17.13; from 5.18 before 5.18.2 — fixed in 5.10.120, 5.15.45, 5.17.13, 5.18.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.120, 5.15.45, 5.17.13, 5.18.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-49555 or the next vulnerability affects your stack