{"id":"CVE-2016-2568","title":"pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.","summary":"pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-116"],"vendor":"freedesktop","product":"polkit","affected":["polkit","enterprise_linux = 6.0","enterprise_linux = 7.0"],"published":"2017-02-13","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:16:38.407","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2016-2568","references":[{"url":"http://www.openwall.com/lists/oss-security/2016/02/26/3","label":"cve@mitre.org"},{"url":"https://access.redhat.com/security/cve/cve-2016-2568","label":"cve@mitre.org"},{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816062","label":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1300746","label":"cve@mitre.org"},{"url":"https://ubuntu.com/security/CVE-2016-2568","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2016/02/26/3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/cve-2016-2568","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816062","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1300746","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ubuntu.com/security/CVE-2016-2568","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00366,"epssPercentile":0.28384,"ingestedAt":"2026-10-08T23:16:47.282Z","slug":"CVE-2016-2568","body":"## Overview\n\npkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.\n\n## Affected\n\n- `polkit`\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}