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CVE-2025-21786

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: workqueue: Put the pwq after detaching the rescuer from the pool The commit 68f83057b913("workqueue: Reap workers via kthread_s…

Published Feb 27, 2025CWE-416EPSS 0.23%

Overview

CVE-2025-21786 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

workqueue: Put the pwq after detaching the rescuer from the pool

The commit 68f83057b913("workqueue: Reap workers via kthread_stop() and

remove detach_completion") adds code to reap the normal workers but

mistakenly does not handle the rescuer and also removes the code waiting

for the rescuer in put_unbound_pool(), which caused a use-after-free bug

reported by Cheung Wall.

To avoid the use-after-free bug, the pool’s reference must be held until

the detachment is complete. Therefore, move the code that puts the pwq

after detaching the rescuer from the pool.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492Refgit.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7eRefgit.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21786?

CVE-2025-21786 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21786?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21786?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21786?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21786 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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