{"id":"UBUNTU-CVE-2023-25809","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`.","modified":"2026-01-30T01:58:52.428374Z","published":"2023-03-29T19:15:00Z","related":["USN-6088-1","USN-6088-2"],"upstream":["CVE-2023-25809"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-25809"},{"type":"REPORT","url":"https://github.com/opencontainers/runc/security/advisories/GHSA-m8cg-xc2p-r3fc"},{"type":"REPORT","url":"https://github.com/opencontainers/runc/commit/0e6b818a2b0d24fdb6697614e5c5f115bbe8e3a5"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6088-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6088-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-25809"}],"affected":[{"package":{"name":"runc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/runc@1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"}]}],"versions":["0.0.8+dfsg-2","0.1.1-0ubuntu5~16.04","1.0.0~rc1-0ubuntu1~16.04","1.0.0~rc1-0ubuntu2~16.04.1","1.0.0~rc1-0ubuntu2~16.04.1.1","1.0.0~rc2-0ubuntu2~16.04.1","1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1","1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1","1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.2","1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.3","1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4","1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm1","1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4","binary_name":"golang-github-opencontainers-runc-dev"},{"binary_version":"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4","binary_name":"runc"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25809.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/runc@1.1.4-0ubuntu1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.4-0ubuntu1~18.04.2"}]}],"versions":["1.0.0~rc2+docker1.13.1-0ubuntu1","1.0.0~rc4+dfsg1-2","1.0.0~rc4+dfsg1-6","1.0.0~rc4+dfsg1-6ubuntu0.18.04.1","1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.1","1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2","1.0.0~rc10-0ubuntu1~18.04.1","1.0.0~rc10-0ubuntu1~18.04.2","1.0.0~rc93-0ubuntu1~18.04.1","1.0.0~rc93-0ubuntu1~18.04.2","1.0.0~rc95-0ubuntu1~18.04.1","1.0.0~rc95-0ubuntu1~18.04.2","1.0.1-0ubuntu2~18.04.1","1.1.0-0ubuntu1~18.04.1","1.1.4-0ubuntu1~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.4-0ubuntu1~18.04.2","binary_name":"golang-github-opencontainers-runc-dev"},{"binary_version":"1.1.4-0ubuntu1~18.04.2","binary_name":"runc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25809.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/runc@1.1.4-0ubuntu1~20.04.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.4-0ubuntu1~20.04.3"}]}],"versions":["1.0.0~rc8+git20190923.3e425f80-0ubuntu1","1.0.0~rc10-0ubuntu1","1.0.0~rc93-0ubuntu1~20.04.1","1.0.0~rc93-0ubuntu1~20.04.2","1.0.0~rc95-0ubuntu1~20.04.1","1.0.0~rc95-0ubuntu1~20.04.2","1.0.1-0ubuntu2~20.04.1","1.1.0-0ubuntu1~20.04.1","1.1.0-0ubuntu1~20.04.2","1.1.4-0ubuntu1~20.04.1","1.1.4-0ubuntu1~20.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.4-0ubuntu1~20.04.3","binary_name":"golang-github-opencontainers-runc-dev"},{"binary_version":"1.1.4-0ubuntu1~20.04.3","binary_name":"runc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25809.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/runc@1.1.4-0ubuntu1~22.04.3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.4-0ubuntu1~22.04.3"}]}],"versions":["1.0.1-0ubuntu2","1.0.1-0ubuntu3","1.0.3-0ubuntu1","1.1.0-0ubuntu1","1.1.0-0ubuntu1.1","1.1.4-0ubuntu1~22.04.1","1.1.4-0ubuntu1~22.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.4-0ubuntu1~22.04.3","binary_name":"golang-github-opencontainers-runc-dev"},{"binary_version":"1.1.4-0ubuntu1~22.04.3","binary_name":"runc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25809.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}