========================================================================== 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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