CVE-2016-2568

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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWE

CWE-116

Published

2017-02-13

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• freedesktop:polkit
• redhat:enterprise_linux

References

• http://www.openwall.com/lists/oss-security/2016/02/26/3
• https://access.redhat.com/security/cve/cve-2016-2568
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816062
• https://bugzilla.redhat.com/show_bug.cgi?id=1300746
• https://ubuntu.com/security/CVE-2016-2568

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