CVE-2025-21786

HIGH EPSS 11.7%
Published Feb 27, 20251y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Feb 27, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
11.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel* <6.12.16
linuxlinux_kernel*≥6.13  –  <6.13.4

References 3

  • git.kernel.org https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f
    Patch