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.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-2568.json"
[ { "events": [ { "introduced": "0" }, { "last_affected": "6.0" } ] }, { "events": [ { "introduced": "0" }, { "last_affected": "7.0" } ] } ]