RHEL 9 must disable the use of user namespaces.
An XCCDF Rule
Description
User namespaces are used primarily for Linux containers. The value "0" disallows the use of user namespaces.
- ID
- SV-257816r1014825_rule
- Version
- RHEL-09-213105
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure RHEL 9 to disable the use of user namespaces by adding the following line to a file, in the "/etc/sysctl.d" directory:
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