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[USN-7956-1] Google Guest Agent vulnerability

Posted on 13 January 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7956-1
January 13, 2026

google-guest-agent vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Google Guest Agent could be made to crash if it received specially
crafted network traffic.

Software Description:
- 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:

Ubuntu 25.10
google-guest-agent 20250506.01-0ubuntu1.1

Ubuntu 25.04
google-guest-agent 20250116.00-0ubuntu2.2

Ubuntu 24.04 LTS
google-guest-agent 20250116.00-0ubuntu1~24.04.3

Ubuntu 22.04 LTS
google-guest-agent 20250116.00-0ubuntu1~22.04.2

Ubuntu 20.04 LTS
google-guest-agent 20250116.00-0ubuntu1~20.04.0+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
google-guest-agent 20241011.01-0ubuntu1~18.04.0+esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
google-guest-agent 20240716.00-0ubuntu1~16.04.0+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7956-1
CVE-2025-58181

Package Information:
https://launchpad.net/ubuntu/+source/google-guest-agent/20250506.01-0ubuntu1.1
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu2.2
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu1~24.04.3
https://launchpad.net/ubuntu/+source/google-guest-agent/20250116.00-0ubuntu1~22.04.2

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