drm/gem: fix race between change_handle and handle_delete

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63885
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:05 UTC
Updated2026-07-20 15:16:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/gem: fix race between change_handle and handle_delete drm_gem_change_handle_ioctl leaves the old handle live in the IDR during the window between spin_unlock(table_lock) and the final spin_lock(table_lock). A concurrent drm_gem_handle_delete on the old handle succeeds in this window, decrements handle_count to 0, and frees the GEM object while the new handle's IDR entry still references it. NULL the old handle's IDR entry before dropping table_lock so that any concurrent GEM_CLOSE on the old handle sees NULL and returns -EINVAL. Restore the old entry on the prime-bookkeeping error path.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.001980000 probability, percentile 0.097880000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 672464dd53231509c9c771110798c56d4660e19e 0dfa42cfe4dbe114533480503934f43e33c1e83d git Not specified
CNA Linux Linux affected 61bd96d3e5472c253f9c1ab77608f0c8aaa9d025 cde2c9257cbe8463b9dcf7b1075177b72b5fd938 git Not specified
CNA Linux Linux affected 5e28b7b94408897e41c63477aabc9e1db439bc8c 7164d78559b0ff29931a366a840a9e5dd53d4b7c git Not specified
CNA Linux Linux affected 6.18.32 6.18.35 semver Not specified
CNA Linux Linux affected 7.0.9 7.0.12 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cde2c9257cbe8463b9dcf7b1075177b72b5fd938 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0dfa42cfe4dbe114533480503934f43e33c1e83d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7164d78559b0ff29931a366a840a9e5dd53d4b7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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