Bug 2373356 (CVE-2025-38038)

Summary:	CVE-2025-38038 kernel: Linux kernel: Denial of Service in amd-pstate cpufreq driver via deadlock
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel. A local user could trigger a deadlock in the cpufreq: amd-pstate driver. This occurs when a lock intended for per-policy function calls conflicts with another lock during a mode-switch operation. This vulnerability can lead to a system hang, resulting in a Denial of Service (DoS).	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-06-18 10:03:19 UTC

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: amd-pstate: Remove unnecessary driver_lock in set_boost

set_boost is a per-policy function call, hence a driver wide lock is
unnecessary. Also this mutex_acquire can collide with the mutex_acquire
from the mode-switch path in status_store(), which can lead to a
deadlock. So, remove it.

Comment 1 Avinash Hanwate 2025-06-20 19:05:54 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025061827-CVE-2025-38038-797b@gregkh/T