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[USN-8601-1] PAM vulnerability

Posted on 23 July 2026
Ubuntu Security

==========================================================================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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Content-Description: OpenPGP digital signature

 

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