Ubuntu cifs-utils Important Local Attack Regression USN-8496-2

ubuntu

July 3, 2026

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

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.

Topics Covered

security advisory Ubuntu important local attack regression cifs-utils

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.