---
id: CVE-2026-89823
title: |-
  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
summary: |-
  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 f…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    26d9162213952927cd59c0d94b7e0e992b347bec
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    24d28d15c0f7f7d4a1c229f8730314f0f8758810
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    6729990df9e70623bf53f855b521ae71ca9cb278
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    19dbfe4d586aecfed121cb3fa62281761d9d341f
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    79d09cfe90304ff4f195e47d569800f5e0f8b854
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    2d1215a72159d00001e08dee162e27718934bee9
  - >-
    Linux >= bee330f3d67273a68dcb99f59480d59553c008b2 <
    eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e
  - Linux 4.18
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:11.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89823'
references:
  - url: 'https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.002Z'
epss: 0.00176
epssPercentile: 0.06276
---

## Overview

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().

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.