drm/xe/pt: prevent invalid cursor access for purged BOs

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Summary

CVECVE-2026-72358
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:09 UTC
Updated2026-08-15 06:22:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/xe/pt: prevent invalid cursor access for purged BOs During a page table walk for binding, xe_pt_stage_bind() explicitly skips initializing the xe_res_cursor for purged BOs, treating them similarly to NULL VMAs by only setting the cursor size. However, xe_pt_hugepte_possible() and xe_pt_scan_64K() did not check if the BO was purged before attempting to walk the cursor using xe_res_dma() and xe_res_next(). Because the cursor was left uninitialized for purged BOs, this falls through and triggers warnings like: WARNING: drivers/gpu/drm/xe/xe_res_cursor.h:274 at xe_res_next Fix this by explicitly checking if the BO is purged in both xe_pt_hugepte_possible() and xe_pt_scan_64K(), returning early just as we do for NULL VMAs, avoiding the invalid cursor accesses entirely. As a precaution, also zero-initialize the cursor in xe_pt_stage_bind() to ensure we don't pass garbage data into the page table walkers if we ever hit a similar edge case in the future. (cherry picked from commit 4c7b9c6ece32440e5a435a92076d049450cd2d2e)

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098750000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ad9843aac91a1eda12912a4922042ea04cfc29dc 2b6b3f98d0e93856bee38699b783c71cb0e9d67f git Not specified
CNA Linux Linux affected ad9843aac91a1eda12912a4922042ea04cfc29dc 8a0fb57675be578c4db19deb4298ed08a70f0f1a git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b6b3f98d0e93856bee38699b783c71cb0e9d67f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8a0fb57675be578c4db19deb4298ed08a70f0f1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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