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[USN-8895-1] Sudo vulnerability

Posted on 07 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8895-1
October 07, 2026

sudo 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:

Sudo could allow a local user to bypass time-based access
restrictions.

Software Description:
- sudo: Provide limited super user privileges to specific users

Details:

It was discovered that Sudo did not properly handle time-based access
restrictions when sudoers rules used NOTBEFORE or NOTAFTER with
timestamps omitting the trailing timezone indicator. A local attacker
could possibly use this issue to execute commands outside the intended
time window by manipulating the TZ environment variable.

Update instructions:

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

Ubuntu 26.04 LTS
sudo 1.9.17p2-1ubuntu3.2

Ubuntu 24.04 LTS
sudo 1.9.15p5-3ubuntu5.24.04.4
sudo-ldap 1.9.15p5-3ubuntu5.24.04.4

Ubuntu 22.04 LTS
sudo 1.9.9-1ubuntu2.7
sudo-ldap 1.9.9-1ubuntu2.7

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

References:
https://ubuntu.com/security/notices/USN-8895-1
CVE-2026-96512

Package Information:
https://launchpad.net/ubuntu/+source/sudo/1.9.17p2-1ubuntu3.2
https://launchpad.net/ubuntu/+source/sudo/1.9.15p5-3ubuntu5.24.04.4
https://launchpad.net/ubuntu/+source/sudo/1.9.9-1ubuntu2.7

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