drm/xe/vm: nuke PTs only after unlinking contested VMAs

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Summary

CVECVE-2026-98510
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:02 UTC
Updated2026-10-19 10:19:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/xe/vm: nuke PTs only after unlinking contested VMAs In xe_vm_close_and_put(), external-BO VMAs are queued on the contested list for deferred destruction via xe_vma_destroy_unlocked(). However, xe_vm_pt_destroy() was previously invoked before processing contested VMAs, destroying vm->pt_root while those VMAs were still linked to their respective buffer objects (vm_bo->list.gpuva). If a concurrent thread evicts one of those shared buffer objects, xe_bo_trigger_rebind() holding only bo->resv walks the BO's VMAs and, in fault mode, calls xe_vm_invalidate_vma() -> xe_pt_zap_ptes(). Because vm->pt_root[tile->id] is already NULL, dereferencing pt->level causes a NULL ptr deref. Fix this by deferring xe_vm_free_scratch() and xe_vm_pt_destroy() until after all contested VMAs have been unlinked and destroyed. User is reporting hitting a NULL ptr deref in xe_pt_zap_ptes(), which could be explained by this race. (cherry picked from commit c2863648959489767f08892fd6e90577d2ea0b6a)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc 70fddc065ac80845ffd33095b3635d59883cf7e6 git Not specified
CNA Linux Linux affected b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc ba678c2b02e0d36b53deb5a6d5e5ea044d36def7 git Not specified
CNA Linux Linux affected b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc bddaa5e4094c134452c29e20a26c4718827e4cb1 git Not specified
CNA Linux Linux affected b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc 24a22fb3c731474b68e986af6804db450fb88617 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/24a22fb3c731474b68e986af6804db450fb88617 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba678c2b02e0d36b53deb5a6d5e5ea044d36def7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bddaa5e4094c134452c29e20a26c4718827e4cb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70fddc065ac80845ffd33095b3635d59883cf7e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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