CVE-2025-21786

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

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Severity

Moderate

Red Hat Product Security

7.8

CVSS 3.1

Review impact separately from score.

Published · February 27, 2025

Updated · October 29, 2026

Description

A vulnerability was found in the Linux kernel's work queue subsystem, which manages background task execution. The issue stems from improper handling of the "rescuer" thread during the cleanup of unbound work queues.

Statement

Red Hat Product Security classifies this bug as Moderate based on the following reasons:

Workqueues are not accessible to unprivileged users, such as SELinux lockdown.
Local access is required for this bug to work.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-416 · Use After Free