CVE Database›CVE-2023-25809

CVE-2023-25809

runc: Rootless runc makes `/sys/fs/cgroup` writable

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Severity

Moderate

Red Hat Product Security

6.3

CVSS 3.1

Review impact separately from score.

Published · March 29, 2023

Updated · October 23, 2026

Description

A flaw was found in runc, where it is vulnerable to a denial of service caused by improper access control in the /sys/fs/cgroup endpoint. This flaw allows a local authenticated attacker to cause a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Condition 1: Unshare the cgroup namespace ((docker|podman|nerdctl) run --cgroupns=private). This is the default behavior of Docker/Podman/nerdctl on cgroup v2 hosts. Condition 2 (very rare): add /sys/fs/cgroup to maskedPaths

CVSS / CWE

CVSS 3.1 · 6.3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

CWE-276 · Incorrect Default Permissions