Answer in brief
CVE-2025-21786 records a Unknown severity vulnerability in workqueue: Put the pwq after detaching the rescuer from the pool. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=68f83057b913467a999e1bf9e0da6a119668f769 <e7c16028a424dd35be1064a68fa318be4359310f || >=68f83057b913467a999e1bf9e0da6a119668f769 <835b69c868f53f959d4986bbecd561ba6f38e492 || >=68f83057b913467a999e1bf9e0da6a119668f769 <e76946110137703c16423baf6ee177b751a34b7e | e7c16028a424dd35be1064a68fa318be4359310f, 835b69c868f53f959d4986bbecd561ba6f38e492, e76946110137703c16423baf6ee177b751a34b7e |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-21786 records a Unknown severity vulnerability in workqueue: Put the pwq after detaching the rescuer from the pool. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=68f83057b913467a999e1bf9e0da6a119668f769 <e7c16028a424dd35be1064a68fa318be4359310f || >=68f83057b913467a999e1bf9e0da6a119668f769 <835b69c868f53f959d4986bbecd561ba6f38e492 || >=68f83057b913467a999e1bf9e0da6a119668f769 <e76946110137703c16423baf6ee177b751a34b7e | e7c16028a424dd35be1064a68fa318be4359310f, 835b69c868f53f959d4986bbecd561ba6f38e492, e76946110137703c16423baf6ee177b751a34b7e |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.