CVE-2017-7358: Canonical Ubuntu Linux

High severity, CVSS 7.3. EPSS: 2.7% chance of exploitation in the next 30 days.

In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 16.10 only
• Lightdm Project Lightdm: up to and including 1.22.0

Published 2017-04-05. Last modified 2026-06-17.