Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

The Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide (V1 R8) has 439 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V1 · R8

CurrentPublished Wed Sep 30 2026

AlmaLinux OS 9 must disable the Controller Area Network (CAN) kernel module.

Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

Assessment Title

Rule Text

AlmaLinux OS 9 must disable the Controller Area Network (CAN) kernel module.

Description

Discussion Text

The CAN protocol is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer.

Disabling CAN protects the system against exploitation of any flaws in its implementation.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-269343

Rule

SV-269343r1050225_rule

Severity

medium

Rule Version

ALMA-09-029830

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify that AlmaLinux OS 9 disables the ability to load the can kernel module with the following command:

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

/etc/modprobe.d/can.conf:install can /bin/false
/etc/modprobe.d/can.conf: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.

Implementation Procedure

Fix Text

To configure the system to prevent the can kernel module from being loaded, run the following command:

$ cat << EOF | tee /etc/modprobe.d/can.conf 
install can /bin/false
blacklist can
EOF

STIG check 233 of 439 in the Cloud Linux AlmaLinux OS 9 STIG checklist

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