CVE-2026-89823

In 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().

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f
https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810
https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec
https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9
https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278
https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854
https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c
https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e

Configurations

No configuration.

History

16 Sep 2026, 15:18

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

Information

Published : 2026-09-16 11:16

Updated : 2026-09-16 15:18

NVD link : CVE-2026-89823

Mitre link : CVE-2026-89823

CVE.ORG link : CVE-2026-89823

JSON object : View

Products Affected

No product.

CWE

No CWE.

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Since the\nunplugged flag was never set, the ioctl proceeds while the error path\ntears down device resources.\n\nFix this by introducing drm_dev_synchronize_unplug(), which sets the\nunplugged flag and waits for the SRCU barrier, ensuring all in-flight\ndrm_dev_enter() critical sections complete before cleanup proceeds; call\nit on the error path of drm_dev_register()."}], "lastModified": "2026-09-16T15:18:11.300", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}