{"id":"UBUNTU-CVE-2018-6556","details":"lxc-user-nic when asked to delete a network interface will unconditionally open a user provided path. This code path may be used by an unprivileged user to check for the existence of a path which they wouldn't otherwise be able to reach. It may also be used to trigger side effects by causing a (read-only) open of special kernel files (ptmx, proc, sys). Affected releases are LXC: 2.0 versions above and including 2.0.9; 3.0 versions above and including 3.0.0, prior to 3.0.2.","modified":"2026-04-22T12:02:39.751975Z","published":"2018-08-06T16:00:00Z","related":["USN-3730-1"],"upstream":["CVE-2018-6556"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6556"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3730-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-6556"}],"affected":[{"package":{"name":"lxc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/lxc@3.0.1-0ubuntu1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.1-0ubuntu1~18.04.2"}]}],"versions":["2.1.0-0ubuntu1","2.1.1-0ubuntu1","3.0.0~beta1-0ubuntu3","3.0.0~beta2-0ubuntu2","3.0.0~beta3-0ubuntu1","3.0.0~beta4-0ubuntu1","3.0.0-0ubuntu1","3.0.0-0ubuntu2","3.0.1-0ubuntu1~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"liblxc-common"},{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"liblxc1"},{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"libpam-cgfs"},{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"lxc"},{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"lxc-utils"},{"binary_version":"3.0.1-0ubuntu1~18.04.2","binary_name":"lxc1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6556.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}