Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.12.16 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492Patch
- https://git.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7ePatch
- https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310fPatch
FAQ
What is CVE-2025-21786?
CVE-2025-21786 is a vulnerability with a CVSS score of 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_stop...
How severe is CVE-2025-21786?
CVE-2025-21786 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-21786?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.