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 mounting of cramfs.

Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

Assessment Title

Rule Text

AlmaLinux OS 9 must disable mounting of cramfs.

Description

Discussion Text

Removing support for unneeded filesystem types reduces the local attack surface of the server.

Compressed ROM/RAM file system (or cramfs) is a read-only file system designed for simplicity and space-efficiency. It is mainly used in embedded and small-footprint systems.

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

Objective

V-269344

Rule

SV-269344r1050226_rule

Severity

medium

Rule Version

ALMA-09-029940

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 cramfs kernel module with the following command:

$ grep cramfs /etc/modprobe.conf /etc/modprobe.d/* 

blacklist cramfs

If the command does not return any output, or the line is commented out, and use of cramfs 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 cramfs kernel module from being loaded, create a *.conf file in /etc/modprobe.d/ with the following content:

install cramfs /bin/false
blacklist cramfs

STIG check 234 of 439 in the Cloud Linux AlmaLinux OS 9 STIG checklist

← Previous · V-269343AlmaLinux OS 9 must disable the Controller Area Network (CAN) kernel module.Next · V-269345 →AlmaLinux OS 9 must disable the Stream Control Transmission Protocol (SCTP) kernel module.