USN-8496-2: cifs-utils regression

Publication date

3 July 2026

Overview

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


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute cifs-utils –  2:7.4-1ubuntu0.26.04.2
25.10 questing cifs-utils –  2:7.4-1ubuntu0.25.10.2
24.04 LTS noble cifs-utils –  2:7.0-2ubuntu0.4
22.04 LTS jammy cifs-utils –  2:6.14-1ubuntu0.5

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

Talk to a member of the team ›