Bug 2562657 (CVE-2026-99145)

Summary:	CVE-2026-99145 kernel: kernel: Denial of Service via improper page accounting in drm/xe
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 graphics driver (drm/xe). A local user could exploit this vulnerability by altering the memory state of a pinned graphics buffer object, causing the driver to unconditionally transfer pages between memory tracking pools. This issue triggers an integer underflow and corrupted memory accounting in the kernel shrinker, which may lead to system instability or 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 2026-10-28 10:44:45 UTC

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

drm/xe: Don't transfer shrinker pages for pinned bos on purgeable state change

Pinned bos have their pages removed from the shrinker's shrinkable /
purgeable counts on pin, and added back on unpin according to the
bo's purgeable state at that time.

However, xe_bo_set_purgeable_shrinker() unconditionally transfers
pages between the shrinkable and purgeable counts. If the purgeable
state of a pinned bo changes, for example by userspace madvising
DONTNEED on a VMA of a bo that is also pinned as a scanout buffer,
this underflows one count and, after unpin, leaves the other one
permanently inflated.

Only update the purgeable flag for pinned bos, and leave the page
accounting to unpin.

(cherry picked from commit afe6bc012034123fd838328668e609bf57e46bd3)