STIGQter: STIG Summary: Anduril NixOS Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Oct 2025:

NixOS must take action when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity.

DISA Rule

SV-268104r1131010_rule

Vulnerability Number

V-268104

Group Title

SRG-OS-000046-GPOS-00022

Rule Version

ANIX-00-000430

Severity

CAT II

CCI(s)

• CCI-000139 - Alert organization-defined personnel or roles within an organization-defined time period in the event of an audit logging process failure.

Weight

10

Fix Recommendation

Configure the operating system to initiate an action to notify the system administrator (SA) and information system security officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity.

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix:

environment.etc."audit/auditd.conf".text = [
''
admin_space_left = 10%
''
];

Rebuild and switch to the new NixOS configuration:
$ sudo nixos-rebuild switch

Check Contents

Verify NixOS takes action when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity with the following commands:

$ sudo grep -w admin_space_left /etc/audit/auditd.conf

admin_space_left = 10%

If the value of the "admin_space_left" keyword is not set to "10%" or if the line is commented out, this is a finding.

Vulnerability Number

V-268104

Documentable

False

Rule Version

ANIX-00-000430

Severity Override Guidance

Verify NixOS takes action when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity with the following commands:

$ sudo grep -w admin_space_left /etc/audit/auditd.conf

admin_space_left = 10%

If the value of the "admin_space_left" keyword is not set to "10%" or if the line is commented out, this is a finding.

Check Content Reference

M

Target Key

5658