CVE Catalog

CVE-2026-89823

HighCVSS 7.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.17%

6th percentile - higher than 6% of all known CVEs

Summary

In the Linux kernel, there is a race between a partial drm_dev_register() failure and an ioctl. If registration fails after a minor is registered, userspace may have entered a drm_dev_enter() critical section, and since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources.

Risk Assessment

This may lead to use-after-free and a kernel panic or other serious errors during a failed DRM device registration.

Recommendation

Update the Linux kernel to a version with the fix introducing drm_dev_synchronize_unplug() called on the drm_dev_register() error path.

Related vulnerabilities

Original NVD description (English source)

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().

Vulnerability data from NVD (NIST) · CISA KEV · EPSS