USN-7761-1: PAM vulnerability

Publication date

22 September 2025

Overview

PAM could allow unintended access to network services.


Packages

  • pam - Pluggable Authentication Modules

Details

It was discovered that the PAM pam_access module incorrectly parsed
certain rules as hostnames. An attacker could possibly use this issue to
spoof hostnames and bypass access restrictions.

It was discovered that the PAM pam_access module incorrectly parsed
certain rules as hostnames. An attacker could possibly use this issue to
spoof hostnames and bypass access restrictions.

Update instructions

After a standard system update you need to reboot your computer to 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
25.04 plucky libpam-modules –  1.5.3-7ubuntu4.4
24.04 noble libpam-modules –  1.5.3-5ubuntu5.5

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Have additional questions?

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