USN-7956-1: Google Guest Agent vulnerability

USN-7956-1: Google Guest Agent vulnerability

Publication date: 13 January 2026
Overview: Google Guest Agent could be made to crash if it received specially crafted network traffic.

Packages
google-guest-agent - Google Compute Engine Guest Agent

Details
Jakub Ciolek discovered that the Go Cryptography module included in
Google Guest Agent did not validate GSSAPI authentication requests during
SSH operations. An attacker could possibly use this issue to cause a
denial of service.

Update instructions
The problem can be corrected by updating your system to the following package versions:

• 25.10 questing google-guest-agent – 20250506.01-0ubuntu1.1
• 25.04 plucky google-guest-agent – 20250116.00-0ubuntu2.2
• 24.04 LTS noble google-guest-agent – 20250116.00-0ubuntu1~24.04.3
• 22.04 LTS jammy google-guest-agent – 20250116.00-0ubuntu1~22.04.2
• 20.04 LTS focal google-guest-agent – 20250116.00-0ubuntu1~20.04.0+esm2
• 18.04 LTS bionic google-guest-agent – 20241011.01-0ubuntu1~18.04.0+esm2
• 16.04 LTS xenial google-guest-agent – 20240716.00-0ubuntu1~16.04.0+esm2