auxdisplay: charlcd: cancel backlight work on registration failure (CVE-2026-89585) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89585

auxdisplay: charlcd: cancel backlight work on registration failure

Answer in brief

CVE-2026-89585 records a Unknown severity vulnerability in auxdisplay: charlcd: cancel backlight work on registration failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=39f8ea46724efbed3ca021863a22337c31be264c <fe7ba73dde94c5f413b1588cd444b49105015dda \|\| >=39f8ea46724efbed3ca021863a22337c31be264c <84858671842ae5857b9ed1202b62f9045373dcd1 \|\| >=39f8ea46724efbed3ca021863a22337c31be264c <ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755 \|\| >=39f8ea46724efbed3ca021863a22337c31be264c <e3e3bf40916c1e810df03958cfa7ba6883cdce79	fe7ba73dde94c5f413b1588cd444b49105015dda, 84858671842ae5857b9ed1202b62f9045373dcd1, ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755, e3e3bf40916c1e810df03958cfa7ba6883cdce79
Linux/Linuxgeneric	4.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to fe7ba73dde94c5f413b1588cd444b49105015dda if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.