Title

RHEL 9 must be configured to disable the Controller Area Network kernel module. (Cat II impact)

Discussion

Disabling Controller Area Network (CAN) protects the system against exploitation of any flaws in its implementation.

Check Content

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

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

Additional Identifiers

Rule ID: SV-257805r958478_rule

Vulnerability ID: V-257805

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.