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 Stream Control Transmission Protocol (SCTP) kernel module.

Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

Assessment Title

Rule Text

AlmaLinux OS 9 must disable the Stream Control Transmission Protocol (SCTP) kernel module.

Description

Discussion Text

The SCTP is a transport layer protocol, designed to support the idea of message-oriented communication, with several streams of messages within one connection.

Disabling SCTP 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-269345

Rule

SV-269345r1050227_rule

Severity

medium

Rule Version

ALMA-09-030050

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 SCTP kernel module with the following command:

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

/etc/modprobe.d/sctp.conf:install sctp /bin/false
/etc/modprobe.d/sctp.conf:blacklist sctp

If the command does not return any output, or the line is commented out, and use of SCTP 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 SCTP kernel module from being loaded, run the following command:

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

STIG check 235 of 439 in the Cloud Linux AlmaLinux OS 9 STIG checklist

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