---
name: "lynis-linux-security-auditing"
description: "Perform comprehensive security audits and compliance benchmarking on Linux systems."
metadata:
  author: "CISOfy"
  version: "1.0.0"
  runtime_compatibility:
    - "codex"
    - "claude-code"
    - "cursor"
    - "windsurf"
triggers:
  - "run lynis security audit"
  - "check linux hardening score"
  - "fix lynis warnings linux"
permissions:
  fs_read: true
  fs_write: "workspace"
  shell_exec: false
  net_access: false
---

# Lynis Linux System Hardening & Compliance Auditing

Executes Lynis security auditing: vulnerability scanning, kernel hardening checks, open port analysis, SSH configuration verification, and generating hardening index scores.

## When to Invoke
Invoke this skill whenever you need to:
- run lynis security audit
- check linux hardening score
- fix lynis warnings linux

## Execution SOP & Rules
1. Execute lynis audit system -Q to run non-interactive automated system scans.
2. Review /var/log/lynis-report.dat to inspect warnings, suggestions, and hardening index.
3. Implement recommended kernel parameter hardening inside /etc/sysctl.d/99-security.conf.
4. Establish automated cron jobs running Lynis audits weekly and reporting regressions.

## Verification Checklist
- Run local linting, syntax validation, and type-checks before reporting completion.
- Ensure all created or modified files adhere to workspace boundaries and avoid uncommitted secrets.
- Verify tests or build commands exit cleanly with return code 0.