drm/xe: fix NPD in bo_meminfo()

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Summary

CVECVE-2026-72359
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: fix NPD in bo_meminfo() When a buffer object is purged, its ttm.resource is set to NULL via the TTM pipeline gutting flow. However, the BO remains in the client's object list until userspace explicitly closes the GEM handle. If memory stats are queried during this time, accessing bo->ttm.resource->mem_type will result in a NULL pointer dereference. Fix this by safely skipping purged BOs in bo_meminfo, as they no longer consume any memory. User is getting NPD on device resume, and possible theory is that in bo_move(), if we need to evict something to SYSTEM to save the CCS state, but the BO is marked as dontneed, this won't trigger a move but will nuke the pages, leaving us with a NULL bo resource. And the meminfo() doesn't look ready to handle a NULL resource. v2 (Sashiko): - There could potentially be other cases where we might end up with a NULL resource, so make this a general NULL check for now. (cherry picked from commit c9a8e7daa0afe3161111e27fd92176e608c7f186)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ad9843aac91a1eda12912a4922042ea04cfc29dc 5ff2212f0e0779b0b0cbf91fbf970144107c4257 git Not specified
CNA Linux Linux affected ad9843aac91a1eda12912a4922042ea04cfc29dc b5c55015d4164a0f206bcdcf2985da948b3c7837 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/b5c55015d4164a0f206bcdcf2985da948b3c7837 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ff2212f0e0779b0b0cbf91fbf970144107c4257 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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