SB20260529181 - Use-after-free in Linux kernel damon
Published: May 29, 2026
Security Bulletin ID
SB20260529181
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-46121)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in DAMON sysfs memcg_path file handling when performing concurrent reads and writes through separate open files. A local user can trigger concurrent access to a freed buffer to cause a denial of service.
The issue affects user-driven direct reads and writes, while reads performed during parameter committing are separately synchronized.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1e68eb96e8beb1abefd12dd22c5637795d8a877e
- https://git.kernel.org/stable/c/b1e9f2d5870776347edef927f9bb3ea19b8e3abb
- https://git.kernel.org/stable/c/baecc45ad60e621ef14d6c1e7f41ef36bbfdf910
- https://git.kernel.org/stable/c/c88802d0e8edd14b6cd2daf3000f99adbc4c85c5
- https://git.kernel.org/stable/c/eafd6f5372d29b0dd213799b92c2c9c7ad31d7da