Red Hat Enterprise Linux 9 Security Technical Implementation Guide

The Red Hat Enterprise Linux 9 Security Technical Implementation Guide (V2 R9) has 445 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

V2 · R9

ArchivedPublished Wed Jul 01 2026

RHEL 9 audit system must protect logon UIDs from unauthorized change.

Red Hat Enterprise Linux 9 Security Technical Implementation Guide

Assessment Title

Rule Text

RHEL 9 audit system must protect logon UIDs from unauthorized change.

Description

Discussion Text

If modification of login user identifiers (UIDs) is not prevented, they can be changed by nonprivileged users and make auditing complicated or impossible.

Satisfies: SRG-OS-000462-GPOS-00206, SRG-OS-000475-GPOS-00220, SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

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

Objective

V-258228

Rule

SV-258228r991572_rule

Severity

medium

Rule Version

RHEL-09-654270

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify the audit system prevents unauthorized changes to logon UIDs with the following command:

$ sudo grep -i immutable /etc/audit/audit.rules

--loginuid-immutable

If the "--loginuid-immutable" option is not returned in the "/etc/audit/audit.rules", or the line is commented out, this is a finding.

Implementation Procedure

Fix Text

Configure RHEL 9 auditing to prevent modification of login UIDs once they are set by adding the following line to /etc/audit/rules.d/audit.rules:

--loginuid-immutable

The audit daemon must be restarted for the changes to take effect.

STIG check 427 of 445 in the Red Hat Enterprise Linux 9 STIG checklist

← Previous · V-258227RHEL 9 must take appropriate action when a critical audit processing failure occurs.Next · V-258229 →RHEL 9 audit system must protect auditing rules from unauthorized change.