Title

RHEL 9 must be configured to disable the Asynchronous Transfer Mode kernel module. (Cat II impact)

Discussion

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

Check Content

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 Text

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

Additional Identifiers

Rule ID: SV-257804r1044853_rule

Vulnerability ID: V-257804

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.