RHEL 9 must be configured to disable the Controller Area Network kernel module.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257805	RHEL-09-213050	SV-257805r925402_rule		Medium

Description
Disabling Controller Area Network (CAN) 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-61546r925400_chk )
Verify that RHEL 9 disables the ability to load the CAN kernel module with the following command: $ sudo grep -r can /etc/modprobe.conf /etc/modprobe.d/* blacklist can If the command does not return any output, or the line is commented out, and use of CAN is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-61470r925401_fix)
To configure the system to prevent the can kernel module from being loaded, add the following line to the file /etc/modprobe.d/can.conf (or create atm.conf if it does not exist): install can /bin/false blacklist can