CVE-2018-15687: Canonical Ubuntu Linux

High severity, CVSS 7.0. EPSS: 1.1% chance of exploitation in the next 30 days.

A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files. Affected releases are systemd versions up to and including 239.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 18.10 only
• Systemd Project Systemd: from 235, before 240 (fixed in 240)

Published 2018-10-26. Last modified 2026-06-17.