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[USN-8895-2] Sudo vulnerability

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8895-2
November 12, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 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:

USN-8895-1 fixed a vulnerability in Sudo. This update provides the
corresponding updates for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory 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 20.04 LTS
sudo 1.8.31-1ubuntu1.5+esm2
Available with Ubuntu Pro
sudo-ldap 1.8.31-1ubuntu1.5+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
sudo 1.8.21p2-3ubuntu1.6+esm2
Available with Ubuntu Pro
sudo-ldap 1.8.21p2-3ubuntu1.6+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8895-2
https://ubuntu.com/security/notices/USN-8895-1
CVE-2026-96512

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