{"id":"UBUNTU-CVE-2026-41579","details":"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.","modified":"2026-07-01T23:40:25.131661846Z","published":"2026-07-01T02:17:00Z","upstream":["CVE-2026-41579"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41579"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-41579"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/06/13/2"},{"type":"REPORT","url":"https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47"}],"affected":[{"package":{"name":"runc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/runc?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-opencontainers-runc-dev","binary_version":"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"},{"binary_name":"runc","binary_version":"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41579.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/runc?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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~rc7+git20190403.029124da-0ubuntu1~18.04.2+esm1","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","1.1.4-0ubuntu1~18.04.2","1.1.4-0ubuntu1~18.04.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.4-0ubuntu1~18.04.2+esm1","binary_name":"golang-github-opencontainers-runc-dev"},{"binary_name":"runc","binary_version":"1.1.4-0ubuntu1~18.04.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41579.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/runc?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1.1.4-0ubuntu1~20.04.3","1.1.7-0ubuntu1~20.04.1","1.1.7-0ubuntu1~20.04.2","1.1.7-0ubuntu1~20.04.4","1.1.7-0ubuntu1~20.04.5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.7-0ubuntu1~20.04.5","binary_name":"golang-github-opencontainers-runc-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41579.json"}},{"package":{"name":"runc-app","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/runc-app?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.12-0ubuntu2~20.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.12-0ubuntu2~20.04.1","binary_name":"runc"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41579.json"}},{"package":{"name":"runc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/runc?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1.1.4-0ubuntu1~22.04.3","1.1.7-0ubuntu1~22.04.1","1.1.7-0ubuntu1~22.04.2","1.1.7-0ubuntu1~22.04.4","1.1.7-0ubuntu1~22.04.5","1.1.7-0ubuntu1~22.04.6"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-opencontainers-runc-dev","binary_version":"1.1.7-0ubuntu1~22.04.6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41579.json"}},{"package":{"name":"runc-app","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/runc-app?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{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