Bug 2562773 (CVE-2026-99146)

Summary:	CVE-2026-99146 kernel: kernel: Denial of Service via unvalidated DMC firmware load address in i915 driver
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 i915 graphics driver. When parsing Display Microcontroller (DMC) firmware headers, the driver fails to validate the target load address against allowed memory ranges. An attacker capable of supplying a crafted firmware file could exploit this vulnerability to perform invalid hardware register writes, potentially resulting in system instability or a Denial of Service (DoS).	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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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 11:06:47 UTC

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

drm/i915/dmc: Add sanity check for DMC load address

For DMC firmware header version 3, the firmware load address is stored
in dmc_info->start_mmioaddr and later used by dmc_load_program().

Unlike the MMIO address table, the firmware load address is not
validated. Add a sanity check to ensure it is within the valid range.

BSpec: 69671, 68378
(cherry picked from commit 5e47ee5c76ca9becde8df4ad5202845b7ffcbc4c)