CVE-2018-1000001: Canonical Ubuntu Linux

High severity, CVSS 7.8. EPSS: 13.4% chance of exploitation in the next 30 days.

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 17.10 only
• GNU Glibc: up to and including 2.26
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.6 only
• Red Hat Enterprise Linux Server Eus: version 7.6 only
• Red Hat Enterprise Linux Server Tus: version 7.6 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Red Hat Virtualization Host: version 4.0 only

Published 2018-01-31. Last modified 2026-06-17.