What’s Vulnerable › Vulnerabilities

CVE-2026-89585: auxdisplay: charlcd: cancel backlight work on registration failure

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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.

Affected products

• Linux kernel: 4.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/22586432c1aba89d9bd33f3173408dac830f220b
• https://git.kernel.org/stable/c/6eaed64a32e550daf0dc9549742b3ab9e41d984f
• https://git.kernel.org/stable/c/84858671842ae5857b9ed1202b62f9045373dcd1
• https://git.kernel.org/stable/c/cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04
• https://git.kernel.org/stable/c/e3e3bf40916c1e810df03958cfa7ba6883cdce79
• https://git.kernel.org/stable/c/fe7ba73dde94c5f413b1588cd444b49105015dda
• https://git.kernel.org/stable/c/ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755

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