SB20260424267 - Improper input validation in Linux kernel damon

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Main Vulnerability Database SB20260424267

SB20260424267 - Improper input validation in Linux kernel damon

Published: April 24, 2026

Security Bulletin ID SB20260424267
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 input validation (CVE-ID: CVE-2026-31458)

CWE-ID: CWE-20 - Improper input validation

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


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

The vulnerability exists due to improper input validation in damon_sysfs_handle_cmd() when handling sysfs commands after nr_contexts is set to 0. A local privileged user can write crafted values to sysfs control files to cause a denial of service.

The issue is triggered while DAMON is running, and commands other than OFF can dereference contexts_arr[0] after the contexts directory is made empty.


Remediation

Install update from vendor's website.

References