CVE-2026-89823

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

State: Published
Severity: 7.8 High
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	bee330f3d67273a68dcb99f59480d59553c008b2 to before 26d9162213952927cd59c0d94b7e0e992b347becAffected bee330f3d67273a68dcb99f59480d59553c008b2 to before 24d28d15c0f7f7d4a1c229f8730314f0f8758810Affected bee330f3d67273a68dcb99f59480d59553c008b2 to before 6729990df9e70623bf53f855b521ae71ca9cb278Affected bee330f3d67273a68dcb99f59480d59553c008b2 to before a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22cAffected bee330f3d67273a68dcb99f59480d59553c008b2 to before 19dbfe4d586aecfed121cb3fa62281761d9d341fAffected bee330f3d67273a68dcb99f59480d59553c008b2 to before 79d09cfe90304ff4f195e47d569800f5e0f8b854Affected bee330f3d67273a68dcb99f59480d59553c008b2 to before 2d1215a72159d00001e08dee162e27718934bee9Affected bee330f3d67273a68dcb99f59480d59553c008b2 to before eb197f7d60f00d0f5b1b3505dfc86a7e36045a3eAffected
LinuxLinux	4.18Affected before 4.18Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

bee330f3d67273a68dcb99f59480d59553c008b2 to before 26d9162213952927cd59c0d94b7e0e992b347becAffected
bee330f3d67273a68dcb99f59480d59553c008b2 to before 24d28d15c0f7f7d4a1c229f8730314f0f8758810Affected
bee330f3d67273a68dcb99f59480d59553c008b2 to before 6729990df9e70623bf53f855b521ae71ca9cb278Affected
bee330f3d67273a68dcb99f59480d59553c008b2 to before a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22cAffected
bee330f3d67273a68dcb99f59480d59553c008b2 to before 19dbfe4d586aecfed121cb3fa62281761d9d341fAffected
bee330f3d67273a68dcb99f59480d59553c008b2 to before 79d09cfe90304ff4f195e47d569800f5e0f8b854Affected
bee330f3d67273a68dcb99f59480d59553c008b2 to before 2d1215a72159d00001e08dee162e27718934bee9Affected
bee330f3d67273a68dcb99f59480d59553c008b2 to before eb197f7d60f00d0f5b1b3505dfc86a7e36045a3eAffected

LinuxLinux

4.18Affected
before 4.18Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.