CIS Benchmark for Ubuntu 24.04 LTS: Hardening Guide

What the official CIS Benchmark covers

CIS publishes Ubuntu Linux 24.04 LTS Benchmarks. Published recommendation areas (from the v1.0.0 TOC family; confirm your current PDF, including newer listed releases such as 2.0.0) include:

• Initial Setup
• Services
• Network
• Host Based Firewall
• Access Control
• Logging and Auditing
• System Maintenance

Recommendations are tagged by profile — typically Level 1 (L1) as the broadly deployable baseline, and Level 2 (L2) as an extension for higher-security environments. Server and Workstation variants exist — match the PDF to the workload.

Key hardening areas

Mapped to real Ubuntu 24.04 CIS families, without listing individual recommendation IDs:

Initial setup & filesystem

Partitions, kernel modules, package trust, AppArmor, bootloader, and process-hardening themes from Initial Setup.

Services footprint

Disable unused services and configure only what the role needs.

Network & host firewall

Kernel network parameters plus host-based firewall expectations.

Access control

SSH, PAM, user environment, and related login hardening.

Logging, auditing & maintenance

journald, rsyslog, and auditd themes plus system file permissions and account hygiene.

Why manual CIS hardening is hard at scale

• Hundreds of L1/L2 checks across golden images, cloud instances, and long-lived VMs are impractical to tick by hand.
• Unattended upgrades, automation one-offs, and emergency SSH changes create drift.
• Audits need scored evidence, not a bash checklist from last quarter.
• Applying Workstation recommendations to Server — or an outdated Ubuntu CIS PDF — wastes effort and creates false confidence.

How CyberSilo’s CIS Benchmarking Tool helps

CyberSilo’s CIS Benchmarking Tool is built to turn “we have a PDF” into continuous configuration assessment:

• Map Ubuntu 24.04 hosts into an assessable inventory against CIS Benchmark expectations for the platform.
• Score posture and surface gaps across setup, services, network, access, logging, and maintenance themes.
• Detect configuration drift after patching or image refreshes instead of waiting for the next annual audit scramble.
• Prioritise remediation work and keep exportable evidence for programmes that expect a hardened Linux baseline.

FAQ

Is there an official CIS Benchmark for Ubuntu 24.04 LTS?

Yes. CIS publishes Ubuntu Linux 24.04 LTS benchmarks on the CIS Ubuntu Linux benchmarks page. Use the edition and version that match your deployment.

What’s the difference between Level 1 and Level 2?

Level 1 is the essential baseline intended for broad use with limited functional impact. Level 2 extends Level 1 for higher-security environments and may reduce functionality; implementing L2 assumes L1 is also applied.

Server or Workstation PDF?

Use the matching profile. Applying Workstation recommendations to Server roles (or the reverse) produces noise and operational risk.

How does CyberSilo relate to the official CIS PDF?

The official CIS Benchmark remains the authoritative recommendation source. CyberSilo automates assessment, scoring, drift detection, and remediation tracking so teams can operationalise that baseline across Ubuntu estates.