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NixOS must allocate an audit_backlog_limit of sufficient size to capture processes that start prior to the audit daemon.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268093ANIX-00-000260SV-268093r1130988_ruleCCI-000135medium
Description
Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. If auditing is enabled late in the startup process, the actions of some startup processes may not be audited. Some audit systems also maintain state information only available if auditing is enabled before a given process is created. Audit records can be generated from various components within the information system (e.g., module or policy filter). Allocating an audit_backlog_limit of sufficient size is critical in maintaining a stable boot process. With an insufficient limit allocated, the system is susceptible to boot failures and crashes. Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000341-GPOS-00132
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

MON-03.1Sensitive Event Log Information
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (41) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-16Security and Privacy Attributes
1.00
AC-17(1)Monitoring and Control
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3(3)Mandatory Access Control
1.00
AC-6(8)Privilege Levels for Code Execution
1.00
AC-6(9)Log Use of Privileged Functions
1.00
AU-10Non-repudiation
1.00
AU-12Audit Record Generation
1.00
AU-12(3)Changes by Authorized Individuals
1.00

+31 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.3.1
1.00
3.3.2
1.00
CCI1 mapping
CCI-000135
1.00

Details

Check Text (C-268093r1130988_chk)

Verify NixOS allocates a sufficient audit_backlog_limit to capture processes that start prior to the audit daemon with the following command: $ sudo auditctl -s | grep backlog_limit backlog_limit 8192 If the "backlog_limit" entry does not equal "8192" or greater or is missing, this is a finding.

Fix Text (F-71920r1130987_fix)

Configure NixOS to allocate sufficient audit_backlog_limit to capture processes that start prior to the audit daemon. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: boot.kernelParams = [ "audit_backlog_limit=8192" ]; security.audit.backlogLimit = 8192; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch