Bug 2513433 (CVE-2026-68265)

Summary: CVE-2026-68265 kernel: drm/xe/vm: Fix BO prefetch with CONSULT_MEM_ADVISE_PREF_LOC
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. Specifically, within the `drm/xe/vm` module, an out-of-bounds access can occur when handling the `DRM_XE_CONSULT_MEM_ADVISE_PREF_LOC` region for a Buffer Object (BO) Virtual Memory Area (VMA). This happens because a value of -1 is incorrectly used as an index into a memory type array. A local attacker could potentially exploit this to cause a denial of service (DoS) or other system instability.
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Description OSIDB Bzimport 2026-08-10 12:37:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/xe/vm: Fix BO prefetch with CONSULT_MEM_ADVISE_PREF_LOC

When prefetch region is DRM_XE_CONSULT_MEM_ADVISE_PREF_LOC for a BO VMA,
the code used it as an index into region_to_mem_type[], causing an
out-of-bounds access since the value is -1.

Resolve the preferred location for BO VMAs directly: local VRAM on dGFX
(using the BO's tile placement) or system memory on iGPU.

Discovered using AI-assisted static analysis confirmed by Intel Product
Security.

v2:
-Fix null dereference

(cherry picked from commit d9a4906ac03be9f6ed3f3b45c56c866b867fd75b)
Comment 1 Mauro Matteo Cascella 2026-08-11 09:28:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081023-CVE-2026-68265-357b@gregkh/T