CVE-2025-21786
- Source
- https://cve.org/CVERecord?id=CVE-2025-21786
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21786.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-21786
- Downstream
- Related
- Published
- 2025-02-27T02:18:26Z
- Modified
- 2026-08-12T03:30:20Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- workqueue: Put the pwq after detaching the rescuer from the pool
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21786.json" }- References
-
- https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492
- https://git.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7e
- https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21786.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-21786
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git