[USN-8091-1] util-linux vulnerability

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Ubuntu Security Notice USN-8091-1
March 12, 2026

util-linux vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

util-linux could be made to run programs as an administrator.

Software Description:
- util-linux: miscellaneous system utilities

Details:

It was discovered that the util-linux su utility did not drop capabilities
when being used with the --pty option. While not a security issue by
itself, a local attacker could possibly use the su tool to exploit
vulnerabilities in other applications.

Update instructions:

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

Ubuntu 25.10
util-linux 2.41-4ubuntu4.2

Ubuntu 24.04 LTS
util-linux 2.39.3-9ubuntu6.5

Ubuntu 22.04 LTS
util-linux 2.37.2-4ubuntu3.5

Ubuntu 20.04 LTS
util-linux 2.34-0.1ubuntu9.6+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8091-1
https://launchpad.net/bugs/2143850

Package Information:
https://launchpad.net/ubuntu/+source/util-linux/2.41-4ubuntu4.2
https://launchpad.net/ubuntu/+source/util-linux/2.39.3-9ubuntu6.5
https://launchpad.net/ubuntu/+source/util-linux/2.37.2-4ubuntu3.5