CVE-2016-2118: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 36.9% chance of exploitation in the next 30 days.

The MS-SAMR and MS-LSAD protocol implementations in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 mishandle DCERPC connections, which allows man-in-the-middle attackers to perform protocol-downgrade attacks and impersonate users by modifying the client-server data stream, aka "BADLOCK."

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Samba Samba: from 3.6.0, before 4.2.10 (fixed in 4.2.10); from 4.3.0, before 4.3.7 (fixed in 4.3.7); from 4.4.0, before 4.4.1 (fixed in 4.4.1)

Published 2016-04-12. Last modified 2026-06-17.