UNIX symbolic link following in runc - CVE-2025-31133
Published: November 5, 2025 / Updated: April 10, 2026
Vulnerability identifier: #VU118104
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2025-31133
CWE-ID: CWE-61
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: Linux Foundation
Affected software:
runc
runc
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue within the maskedPaths feature. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.
Successful exploitation of this vulnerability may result in privilege escalation.
How to mitigate CVE-2025-31133
Install updates from vendor's website.