[USN-8601-1] PAM vulnerability

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-8601-1
July 23, 2026

pam vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

PAM could be made to expose sensitive information.

Software Description:
- 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.

Update instructions:

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

Ubuntu 26.04 LTS
  libpam-modules                  1.7.0-5ubuntu3.1

Ubuntu 24.04 LTS
  libpam-modules                  1.5.3-5ubuntu5.6

Ubuntu 22.04 LTS
  libpam-modules                  1.4.0-11ubuntu2.7

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8601-1
  CVE-2026-54411

Package Information:
  https://launchpad.net/ubuntu/+source/pam/1.7.0-5ubuntu3.1
  https://launchpad.net/ubuntu/+source/pam/1.5.3-5ubuntu5.6
  https://launchpad.net/ubuntu/+source/pam/1.4.0-11ubuntu2.7
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