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

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.

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

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
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  

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