drm: fix race between partial drm_dev_register() failure and ioctl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89823
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:48 UTC
Updated2026-09-16 15:18:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm: fix race between partial drm_dev_register() failure and ioctl If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources. Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 26d9162213952927cd59c0d94b7e0e992b347bec git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 24d28d15c0f7f7d4a1c229f8730314f0f8758810 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 6729990df9e70623bf53f855b521ae71ca9cb278 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 19dbfe4d586aecfed121cb3fa62281761d9d341f git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 79d09cfe90304ff4f195e47d569800f5e0f8b854 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 2d1215a72159d00001e08dee162e27718934bee9 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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