Use-after-free in Linux kernel - CVE-2026-46121
Published: May 29, 2026
Vulnerability identifier: #VU133075
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-46121
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-46121
Install security update from vendor's repository.
Sources
- 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