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Servers and applications

CVE-2023-25809

rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared

Severity
Medium 6.3
Published
29 Mar 2023
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.1.5
Also known as
GHSA-m8cg-xc2p-r3fc
Sources
NVD, Project advisories (GitHub)

Description

runc is a CLI tool for spawning and running containers according to the OCI specification. In affected versions it was found that rootless runc makes `/sys/fs/cgroup` writable in following conditons: 1. when runc is executed inside the user namespace, and the `config.json` does not specify the cgroup namespace to be unshared (e.g.., `(docker|podman|nerdctl) run --cgroupns=host`, with Rootless…

Affected software

SoftwareAffected versions
runcServers and applications · cpe:a:linuxfoundation:runc
  • Every version before 1.1.5
runcServers and applications · github:opencontainers/runc
  • Every version before 1.1.5

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2023-25809
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2023-25809
  • GitHub Advisory Database https://github.com/advisories/GHSA-m8cg-xc2p-r3fc
  • github.com https://github.com/opencontainers/runc/security/advisories/GHSA-m8cg-xc2p-r3fc