CVE-2026-89823 (CVSS 7.8)

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().

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CVSS v3.1 Score

7.8

HIGH

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

References

Other References

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

Frequently Asked Questions

What is 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(). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89823? +

CVE-2026-89823 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-89823? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-89823

Description

CVSS v3.1 Score

References

Other References

Frequently Asked Questions

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