CVE-2023-25809
runc: Rootless runc makes `/sys/fs/cgroup` writable
Severity
ModerateRed Hat Product Security
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 · 6.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
CWE-276 · Incorrect Default Permissions