---
id: CVE-2026-89585
title: 'auxdisplay: charlcd: cancel backlight work on registration failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  auxdisplay: charlcd: cancel backlight work on registration failure

  With CONFIG_CHARLCD_BL_FLASH, charlcd_init() schedules bl_work before
  charlcd_register() calls misc_…
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'
cvssSource: cna
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    22586432c1aba89d9bd33f3173408dac830f220b
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    6eaed64a32e550daf0dc9549742b3ab9e41d984f
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    fe7ba73dde94c5f413b1588cd444b49105015dda
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    84858671842ae5857b9ed1202b62f9045373dcd1
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755
  - >-
    Linux >= 39f8ea46724efbed3ca021863a22337c31be264c <
    e3e3bf40916c1e810df03958cfa7ba6883cdce79
  - Linux 4.12
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:17.989Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89585'
references:
  - url: 'https://git.kernel.org/stable/c/cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04'
  - url: 'https://git.kernel.org/stable/c/22586432c1aba89d9bd33f3173408dac830f220b'
  - url: 'https://git.kernel.org/stable/c/6eaed64a32e550daf0dc9549742b3ab9e41d984f'
  - url: 'https://git.kernel.org/stable/c/fe7ba73dde94c5f413b1588cd444b49105015dda'
  - url: 'https://git.kernel.org/stable/c/84858671842ae5857b9ed1202b62f9045373dcd1'
  - url: 'https://git.kernel.org/stable/c/ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755'
  - url: 'https://git.kernel.org/stable/c/e3e3bf40916c1e810df03958cfa7ba6883cdce79'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89585.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89585'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532284'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89585'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89585'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89585.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00169
epssPercentile: 0.06186
scores:
  cna: 7.8
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

auxdisplay: charlcd: cancel backlight work on registration failure

With CONFIG_CHARLCD_BL_FLASH, charlcd_init() schedules bl_work before
charlcd_register() calls misc_register(). If registration fails, the
caller frees the charlcd object while delayed work still contains its
address.

Add charlcd_deinit() to cancel the delayed work and turn the backlight
off. Use it for both registration rollback and normal unregistration.

## Affected

- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < 22586432c1aba89d9bd33f3173408dac830f220b`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < 6eaed64a32e550daf0dc9549742b3ab9e41d984f`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < fe7ba73dde94c5f413b1588cd444b49105015dda`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < 84858671842ae5857b9ed1202b62f9045373dcd1`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755`
- `Linux >= 39f8ea46724efbed3ca021863a22337c31be264c < e3e3bf40916c1e810df03958cfa7ba6883cdce79`
- `Linux 4.12`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89585.json)