USN-8601-1: PAM vulnerability

Publication date

23 July 2026

Overview

PAM could be made to expose sensitive information.


Packages

  • pam - Pluggable Authentication Modules

Details

It was discovered that PAM had a timing discrepancy in the pam_userdb
module when comparing plaintext passwords. An attacker could possibly use
this issue to obtain sensitive information by measuring response-timing
differences during repeated authentication attempts.

It was discovered that PAM had a timing discrepancy in the pam_userdb
module when comparing plaintext passwords. An attacker could possibly use
this issue to obtain sensitive information by measuring response-timing
differences during repeated authentication attempts.

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
26.04 LTS resolute libpam-modules –  1.7.0-5ubuntu3.1
24.04 LTS noble libpam-modules –  1.5.3-5ubuntu5.6
22.04 LTS jammy libpam-modules –  1.4.0-11ubuntu2.7

Reduce your security exposure

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