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Ubuntu 26.04 LTS cifs-utils Critical Remote Code Execution USN-8496-3

ubuntu
Calendar Grey July 13, 2026
Dist Ubuntu Esm H88
A critical security advisory for Ubuntu addresses a cifs-utils issue allowing privilege escalation. Update now!
cifs-utils could be made to run programs as an administrator.

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.

Topics%20covered

Topics Covered

security advisory critical Ubuntu execution local attacker cifs-utils

Update Instructions

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

Ubuntu 26.04 LTS
  cifs-utils                      2:7.4-1ubuntu0.26.04.3

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8496-3

Topics%20covered

Topics Covered

security advisory critical Ubuntu execution local attacker cifs-utils

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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