The kdump service on RHEL 9 must be disabled.

Documentable No

Rule ID SV-257818r1044876_rule

CCI References

CCI-000366

Discussion

Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps consume a considerable amount of disk space and may result in denial of service by exhausting the available space on the target file system partition. Unless the system is used for kernel development or testing, there is little need to run the kdump service.

Check Procedure

Verify that the kdump service is disabled in system boot configuration with the following command:

$ sudo systemctl is-enabled  kdump  

disabled 

Verify that the kdump service is not active (i.e., not running) through current runtime configuration with the following command:

$ sudo systemctl is-active kdump 

masked 

Verify that the kdump service is masked with the following command:

$ sudo systemctl show  kdump  | grep "LoadState\|UnitFileState" 

LoadState=masked 
UnitFileState=masked 

If the "kdump" service is loaded or active, and is not masked, this is a finding.

Fix Action

Disable and mask the kdump service on RHEL 9.

To disable the kdump service run the following command:

$ sudo systemctl disable --now kdump

To mask the kdump service run the following command:

$ sudo systemctl mask --now kdump