SB2026050958 - Improper locking in Linux kernel comedi driver

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Main Vulnerability Database SB2026050958

SB2026050958 - Improper locking in Linux kernel comedi driver

Published: May 9, 2026

Security Bulletin ID SB2026050958
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-43340)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper lock initialization in the comedi_device spinlock handling in the COMEDI subsystem when reattaching a COMEDI device to different low-level drivers via the COMEDI_DEVCONFIG ioctl command. A local user can issue crafted device configuration operations to cause a denial of service.

The issue affects COMEDI devices created when the comedi.comedi_num_legacy_minors parameter is non-zero, and inconsistent lock states are reported when different low-level drivers use mismatched spin-lock locking levels.


Remediation

Install update from vendor's website.

References