RHEL 9 must be configured to disable the Asynchronous Transfer Mode kernel module.

Documentable No

Rule ID SV-257804r1044853_rule

CCI References

CCI-000381

Discussion

Disabling Asynchronous Transfer Mode (ATM) protects the system against exploitation of any flaws in its implementation.

Check Procedure

Verify that RHEL 9 disables the ability to load the ATM kernel module with the following command:

$ grep -r atm /etc/modprobe.conf /etc/modprobe.d/*

install atm /bin/false
blacklist atm 

If the command does not return any output, or the line is commented out, and use of ATM is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Fix Action

To configure the system to prevent the atm kernel module from being loaded, add the following line to the file  /etc/modprobe.d/atm.conf (or create atm.conf if it does not exist):

install atm /bin/false
blacklist atm