{"schema_version":"1.7.3","id":"GHSA-m8cg-xc2p-r3fc","published":"2023-03-30T20:17:24Z","modified":"2026-02-04T03:29:19.767788Z","aliases":["CVE-2023-25809","GO-2023-1682"],"related":["CGA-fmvc-cj26-gg63"],"summary":"rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc","details":"### Impact\nIt was found that rootless runc makes `/sys/fs/cgroup` writable in following conditons:\n1. 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)\n2. or, 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)\n\nA container may gain the write access to user-owned cgroup hierarchy `/sys/fs/cgroup/user.slice/...` on the host .\nOther users's cgroup hierarchies are not affected.\n\n### Patches\nv1.1.5 (planned)\n\n### Workarounds\n- 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.\n- Condition 2 (very rare): add `/sys/fs/cgroup` to `maskedPaths`\n","affected":[{"package":{"name":"github.com/opencontainers/runc","ecosystem":"Go","purl":"pkg:golang/github.com/opencontainers/runc"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-m8cg-xc2p-r3fc/GHSA-m8cg-xc2p-r3fc.json"}}],"references":[{"type":"WEB","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":"WEB","url":"https://github.com/opencontainers/runc/commit/0d62b950e60f6980b54fe3bafd9a9c608dc1df17"},{"type":"PACKAGE","url":"https://github.com/opencontainers/runc"}],"database_specific":{"cwe_ids":["CWE-281"],"github_reviewed":true,"github_reviewed_at":"2023-03-30T20:17:24Z","nvd_published_at":"2023-03-29T19:15:00Z","severity":"LOW"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:L"}]}