AlmaLinux OS 9 must remove all software components after updated versions have been installed.

Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by some adversaries.

Verify AlmaLinux OS 9 removes all software components after updated versions have been installed with the following command:

$ dnf config-manager --dump | grep clean

clean_requirements_on_remove = 1

If "clean_requirements_on_remove" is not set to "1", this is a finding.

Configure AlmaLinux OS 9 to remove all software components after updated versions have been installed.

Run the following command to change the configuration of DNF:

$ dnf config-manager --setopt clean_requirements_on_remove=1 --save