SB20260727334 - Use-after-free in Linux kernel damon

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Main Vulnerability Database SB20260727334

SB20260727334 - Use-after-free in Linux kernel damon

Published: July 27, 2026

Security Bulletin ID SB20260727334
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) Use-after-free (CVE-ID: CVE-2026-64239)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [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]


The vulnerability allows a local user to cause a use-after-free.

The vulnerability exists due to use-after-free in DAMON sysfs tried region directory handling when refreshing scheme tried region directories. A local user can repeatedly request directory refresh operations to cause a use-after-free.

The issue can be reproduced on kernels built with CONFIG_DEBUG_KOBJECT_RELEASE because delayed kobject release callbacks can leave freed region objects referenced from the linked list during directory regeneration.


Remediation

Install update from vendor's website.

References