CIS Benchmark for RHEL 9: What Changed from RHEL 8

What the official CIS Benchmark covers

The CIS Red Hat Enterprise Linux 9 Benchmark (v2.0.0) organises recommendations into:

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

Key hardening areas

Mapped to real CIS RHEL 9 sections, without listing individual recommendation IDs:

Initial setup & SELinux

Filesystem partitioning, packaging, SELinux enforcing mode, bootloader, and system-wide crypto policy themes.

Service minimisation

Unused server and client packages plus SSH hardening themes appropriate to the selected profile.

Network & firewalld

Network kernel modules and parameters plus host-based firewall expectations.

Access control

Accounts, PAM and authselect, sudo, and SSH access themes.

Logging, auditd & maintenance

Comprehensive auditing and permission or integrity maintenance themes.

RHEL 8 → RHEL 9: treat it as its own baseline

Do not assume RHEL 8 pass rates or remediation steps copy across. RHEL 9 has its own CIS PDF and profile set — especially around crypto policy, authselect, and package or service inventory differences. Use the RHEL 9 edition for RHEL 9 hosts, and keep RHEL 8 evidence against the RHEL 8 benchmark.

Why manual CIS hardening is hard at scale

• Mixed RHEL 8 and RHEL 9 estates produce confused evidence packs.
• Level 2 settings break applications when applied without staging.
• Golden images drift after errata and rebuilds.
• Teams confuse CIS profiles with STIG editions and apply the wrong checklist.

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 RHEL 9 hosts into an assessable inventory against CIS Benchmark expectations for the platform.
• Score posture and surface gaps across setup, services, network, access, and auditing themes.
• Detect configuration drift after errata instead of waiting for the next audit scramble.
• Prioritise remediation work and keep exportable evidence for programmes that expect a hardened RHEL 9 baseline.

FAQ

Is there an official CIS Benchmark for RHEL 9?

Yes. CIS publishes Red Hat Enterprise Linux 9 benchmarks, including the v2.0.0 family listed on the CIS site.

Does this replace the existing RHEL guide?

No. This is a version-specific companion to the broader RHEL implementation guide, targeting exact-version searches for RHEL 9.

What about RHEL 9 STIG?

CIS also lists STIG editions for some Red Hat releases. Use the CIS Benchmark edition that matches your programme — do not mix STIG and CIS evidence casually.

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.