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 require authentication to access single-user mode.

Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

Assessment Title

Rule Text

AlmaLinux OS 9 must require authentication to access single-user mode.

Description

Discussion Text

This requirement prevents attackers with physical access from easily bypassing security on the machine and gaining root access.

Such accesses are further prevented by configuring the bootloader password.

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

Objective

V-269139

Rule

SV-269139r1137691_rule

Severity

medium

Rule Version

ALMA-09-006510

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify that AlmaLinux OS 9 requires authentication for single-user mode with the following command:

$ grep -E 'ExecStart.*sulogin' /usr/lib/systemd/system/rescue.service 

ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue

If this line is not returned or is commented out, this is a finding.

Implementation Procedure

Fix Text

Configure AlmaLinux OS 9 to require authentication for single-user mode.

Add or modify the following line in the "/usr/lib/systemd/system/rescue.service" file:

ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue

"sudo systemctl edit rescue.service" can also be used to create a "/etc/systemd/system/rescue.service.d/override.conf" file.

STIG check 33 of 439 in the Cloud Linux AlmaLinux OS 9 STIG checklist

← Previous · V-269138AlmaLinux OS 9 must require a unique superuser's name upon booting into single-user and maintenance modes.Next · V-269140 →The systemd Ctrl-Alt-Delete burst key sequence in AlmaLinux OS 9 must be disabled.