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[USN-8496-2] cifs-utils regression

Posted on 03 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8496-2
July 03, 2026

cifs-utils regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

USN-8496-1 introduced a regression in cifs-utils

Software Description:
- cifs-utils: Common Internet File System utilities

Details:

USN-8496-1 fixed a vulnerability in cifs-utils. Unfortunately, the fix
introduced a regression with Kerberos mounts. This update reverts the
security update until a complete fix is available.

We apologize for the inconvenience.

Original advisory details:

It was discovered that cifs-utils incorrectly dropped root privileges
before looking up user information. A local attacker could possibly use
this issue to execute arbitrary code as the root user.

Update instructions:

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

Ubuntu 26.04 LTS
cifs-utils 2:7.4-1ubuntu0.26.04.2

Ubuntu 25.10
cifs-utils 2:7.4-1ubuntu0.25.10.2

Ubuntu 24.04 LTS
cifs-utils 2:7.0-2ubuntu0.4

Ubuntu 22.04 LTS
cifs-utils 2:6.14-1ubuntu0.5

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

References:
https://ubuntu.com/security/notices/USN-8496-2
https://ubuntu.com/security/notices/USN-8496-1
https://launchpad.net/bugs/2159053

Package Information:
https://launchpad.net/ubuntu/+source/cifs-utils/2:7.4-1ubuntu0.26.04.2
https://launchpad.net/ubuntu/+source/cifs-utils/2:7.4-1ubuntu0.25.10.2
https://launchpad.net/ubuntu/+source/cifs-utils/2:7.0-2ubuntu0.4
https://launchpad.net/ubuntu/+source/cifs-utils/2:6.14-1ubuntu0.5

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