{"id":"CVE-2023-25809","summary":"rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc","details":"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 Docker/Podman/nerdctl) or 2. when runc is executed outside the user namespace, and `/sys` is mounted with `rbind, ro` (e.g., `runc spec --rootless`; this condition is very rare). A container may gain the write access to user-owned cgroup hierarchy `/sys/fs/cgroup/user.slice/...` on the host . Other users's cgroup hierarchies are not affected. Users are advised to upgrade to version 1.1.5. Users unable to upgrade may unshare the cgroup namespace (`(docker|podman|nerdctl) run --cgroupns=private)`. This is the default behavior of Docker/Podman/nerdctl on cgroup v2 hosts. or add `/sys/fs/cgroup` to `maskedPaths`.\n","aliases":["GHSA-m8cg-xc2p-r3fc","GO-2023-1682"],"modified":"2026-04-02T08:50:04.843386Z","published":"2023-03-29T18:22:56.875Z","related":["ALSA-2023:6380","ALSA-2023:6938","ALSA-2023:6939","CGA-fmvc-cj26-gg63","MGASA-2023-0125","SUSE-SU-2023:1726-1","SUSE-SU-2023:2003-1","openSUSE-SU-2024:12826-1","openSUSE-SU-2025:15424-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-281"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25809.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25809.json"},{"type":"ADVISORY","url":"https://github.com/opencontainers/runc/security/advisories/GHSA-m8cg-xc2p-r3fc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-25809"},{"type":"FIX","url":"https://github.com/opencontainers/runc/commit/0d62b950e60f6980b54fe3bafd9a9c608dc1df17"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/opencontainers/runc","events":[{"introduced":"0"},{"fixed":"f19387a6bec4944c770f7668ab51c4348d9c2f38"}]}],"versions":["v0.0.1","v0.0.2","v0.0.2.1","v0.0.3","v0.0.4","v0.0.5","v0.0.6","v0.0.7","v0.0.8","v0.0.9","v0.1.0","v0.1.1","v1.0.0","v1.0.0-rc1","v1.0.0-rc10","v1.0.0-rc2","v1.0.0-rc3","v1.0.0-rc4","v1.0.0-rc5","v1.0.0-rc6","v1.0.0-rc7","v1.0.0-rc8","v1.0.0-rc9","v1.0.0-rc90","v1.0.0-rc91","v1.0.0-rc92","v1.0.0-rc93","v1.0.0-rc94","v1.0.0-rc95","v1.0.1","v1.0.2","v1.0.3","v1.1.0","v1.1.0-rc.1","v1.1.1","v1.1.2","v1.1.3","v1.1.4","v1.2.0","v1.2.0-rc.1","v1.2.0-rc.2","v1.2.0-rc.3","v1.2.1","v1.2.2","v1.2.3","v1.2.4","v1.2.5","v1.2.6","v1.2.7","v1.2.8","v1.2.9","v1.3.0","v1.3.0-rc.1","v1.3.0-rc.2","v1.3.1","v1.3.2","v1.3.3","v1.3.4","v1.3.5","v1.4.0","v1.4.0-rc.1","v1.4.0-rc.2","v1.4.0-rc.3","v1.4.1","v1.5.0-rc.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-25809.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L"}]}