Ubuntu Security Notices USN-8496-2 USN-8496-2: cifs-utils regression Publication date 3 July 2026 Overview USN-8496-1 introduced a regression in cifs-utils Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References 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. Get Ubuntu Pro References https://launchpad.net/bugs/2159053