Bug 2407335 (CVE-2025-40086)

Summary:	CVE-2025-40086 kernel: drm/xe: Don't allow evicting of BOs in same VM in array of VM binds
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
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's Intel Xe GPU driver. During an array of VM bind operations, buffer objects (BOs) within the same VM can be incorrectly evicted under certain conditions. This eviction leads to NULL pointer dereferences later in the bind pipeline when the code attempts to access the evicted resources. A local user with access to Intel Xe GPU resources could trigger this condition, causing a kernel crash and denial of service.	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 2025-10-30 10:02:16 UTC

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

drm/xe: Don't allow evicting of BOs in same VM in array of VM binds

An array of VM binds can potentially evict other buffer objects (BOs)
within the same VM under certain conditions, which may lead to NULL
pointer dereferences later in the bind pipeline. To prevent this, clear
the allow_res_evict flag in the xe_bo_validate call.

v2:
 - Invert polarity of no_res_evict (Thomas)
 - Add comment in code explaining issue (Thomas)

(cherry picked from commit 8b9ba8d6d95fe75fed6b0480bb03da4b321bea08)

Comment 1 Jon Moroney 2025-10-30 16:36:07 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025103013-CVE-2025-40086-f0f7@gregkh/T