CVE-2016-4580: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 4.1% chance of exploitation in the next 30 days.

The x25_negotiate_facilities function in net/x25/x25_facilities.c in the Linux kernel before 4.5.5 does not properly initialize a certain data structure, which allows attackers to obtain sensitive information from kernel stack memory via an X.25 Call Request.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Linux Linux Kernel: up to and including 4.5.4

Published 2016-05-23. Last modified 2026-06-17.