Bug 2422807 (CVE-2025-68314)

Summary:	CVE-2025-68314 kernel: Linux kernel drm/msm: Privilege escalation or information disclosure due to improper last_fence update
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:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the Linux kernel's `drm/msm` component. A local attacker could exploit this vulnerability by not properly updating the `last_fence` in the `vm-bind` path. This oversight can lead to resources being freed while still in use, potentially causing system faults, information disclosure, or privilege escalation.	Story Points:	---
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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 2025-12-16 16:02:59 UTC

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

drm/msm: make sure last_fence is always updated

Update last_fence in the vm-bind path instead of kernel managed path.

last_fence is used to wait for work to finish in vm_bind contexts but not
used for kernel managed contexts.

This fixes a bug where last_fence is not waited on context close leading
to faults as resources are freed while in use.

Patchwork: https://patchwork.freedesktop.org/patch/680080/

Comment 1 Alexander B 2025-12-16 19:13:23 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121655-CVE-2025-68314-847b@gregkh/T