auxdisplay: charlcd: cancel backlight work on registration failure
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
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_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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 6 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89585
- 2026-10-03 Alias added: GHSA-72rp-5pw2-wrgc
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04
- https://git.kernel.org/stable/c/22586432c1aba89d9bd33f3173408dac830f220b
- https://git.kernel.org/stable/c/6eaed64a32e550daf0dc9549742b3ab9e41d984f
- https://git.kernel.org/stable/c/fe7ba73dde94c5f413b1588cd444b49105015dda
- https://git.kernel.org/stable/c/84858671842ae5857b9ed1202b62f9045373dcd1
- https://git.kernel.org/stable/c/ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755
- https://git.kernel.org/stable/c/e3e3bf40916c1e810df03958cfa7ba6883cdce79
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Sources
- CVE-2026-89585 · CVE Program
- CVE-2026-89585 · NVD
- FIRST EPSS
- GHSA-72rp-5pw2-wrgc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89585 · Red Hat security data · CC BY 4.0
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