CVE-2018-6559: Canonical Ubuntu Linux

Low severity, CVSS 3.3. EPSS: 0.5% chance of exploitation in the next 30 days.

The Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, allows local users to obtain names of files in which they would not normally be able to access via an overlayfs mount inside of a user namespace.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 18.10 only
• Linux Linux Kernel: affected versions not specified

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