---
title: "CVE-2026-89823: Linux Kernel drm - Race Condition"
description: "Linux kernel contains a race condition in drm_dev_register() caused by improper synchronization between partial device registration failure and ioctl handling, letting local userspace attackers cause resource teardown during ioctl, exploit requires userspace to open device minor."
url: https://panop.io/threat-heartbeat/CVE-2026-89823/
---

# CVE-2026-89823 Linux Kernel drm - Race Condition

Linux kernel contains a race condition in drm\_dev\_register() caused by improper synchronization between partial device registration failure and ioctl handling, letting local userspace attackers cause resource teardown during ioctl, exploit requires userspace to open device minor.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89823)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the drm\_dev\_synchronize\_unplug() fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89823](https://nvd.nist.gov/vuln/detail/CVE-2026-89823)
- [https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c](https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c)
- [https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e](https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e)
- [https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f](https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f)
- [https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810](https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810)
- [https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec](https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec)
- [https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9](https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9)
- [https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278](https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278)
- [https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854](https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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