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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257804	RHEL-09-213045	SV-257804r925399_rule		Medium

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

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61545r925397_chk )
Verify that RHEL 9 disables the ability to load the ATM kernel module with the following command: $ sudo grep -r atm /etc/modprobe.conf /etc/modprobe.d/* 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 (F-61469r925398_fix)
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