Bug 2395426 (CVE-2023-53258)

Summary:	CVE-2023-53258 kernel: drm/amd/display: Fix possible underflow for displays with large vblank
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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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-09-15 15:13:16 UTC

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

drm/amd/display: Fix possible underflow for displays with large vblank

[Why]
Underflow observed when using a display with a large vblank region
and low refresh rate

[How]
Simplify calculation of vblank_nom

Increase value for VBlankNomDefaultUS to 800us

Comment 1 Jon Moroney 2025-09-15 16:39:13 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091503-CVE-2023-53258-35f0@gregkh/T