OL 9 must disable the use of user namespaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271727 | OL09-00-002370 | SV-271727r1091893_rule | Medium |
| Description |
| User namespaces are used primarily for Linux containers. The value "0" disallows the use of user namespaces. |
| STIG | Date |
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 |
Details
| Check Text (C-75777r1091891_chk) |
| Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is Not Applicable. Verify that OL 9 disables the use of user namespaces with the following commands: $ sysctl user.max_user_namespaces user.max_user_namespaces = 0 If the returned line does not have a value of "0", or a line is not returned, this is a finding. |
| Fix Text (F-75684r1091892_fix) |
| Configure OL 9 to disable the use of user namespaces by adding the following line to a file, in the "/etc/sysctl.d" directory: Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is Not Applicable. user.max_user_namespaces = 0 The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command: $ sudo sysctl --system |