Vulnerability details
CVE-2025-21786
Linux Linux
workqueue: Put the pwq after detaching the rescuer from the pool
CVSS 3.1
7.8High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 6.11 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 68f83057b913467a999e1bf9e0da6a119668f769 ≤ v < e7c16028a424dd35be1064a68fa318be4359310f | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 68f83057b913467a999e1bf9e0da6a119668f769 ≤ v < 835b69c868f53f959d4986bbecd561ba6f38e492 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 68f83057b913467a999e1bf9e0da6a119668f769 ≤ v < e76946110137703c16423baf6ee177b751a34b7e | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2025-02-27
- Last updated
- 2026-08-05
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.23%
Probability of exploitation in 30 days
14.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free