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[USN-8496-3] cifs-utils vulnerability

Posted on 13 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8496-3
July 13, 2026

cifs-utils 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:

cifs-utils could be made to run programs as an administrator.

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

Details:

USN-8496-1 fixed vulnerabilities in cifs-utils. The update caused a
regression and was backed out in USN-8496-2. This update reintroduces the
security fix, along with a fix for the regression.

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 2:7.4-1ubuntu0.26.04.3

Ubuntu 24.04 LTS
cifs-utils 2:7.0-2ubuntu0.5

Ubuntu 22.04 LTS
cifs-utils 2:6.14-1ubuntu0.6

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

References:
https://ubuntu.com/security/notices/USN-8496-3
https://ubuntu.com/security/notices/USN-8496-2
https://ubuntu.com/security/notices/USN-8496-1
CVE-2026-12505

Package Information:
https://launchpad.net/ubuntu/+source/cifs-utils/2:7.4-1ubuntu0.26.04.3
https://launchpad.net/ubuntu/+source/cifs-utils/2:7.0-2ubuntu0.5
https://launchpad.net/ubuntu/+source/cifs-utils/2:6.14-1ubuntu0.6

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