CF12-S16: AI Infrastructure OS Hardening

AI Control Library / CF-12: Security & Abuse Resistance

Designation: Supplemental | Control types represented: Operational and Technical

Control requirement

Harden operating systems and runtime images supporting AI workloads using approved baselines, minimal services, controlled privileges and maintained security updates. Detect material configuration drift.

Why this matters

An AI application inherits vulnerabilities from hosts, containers and supporting runtimes. Unused services and privileged execution enlarge the effect of compromise.

How the control types work together

Operational controls define scope, authority and the actions required when conditions are not met. Technical controls produce evidence or enforce the relevant boundaries. Both must apply to the same deployment and operating conditions.

When it applies

Apply to servers, virtual machines, containers, notebooks and accelerator hosts within the managed boundary. Account for provider-controlled layers.

Define the assessed boundary, dependencies and evidence limitations. Tailor depth and review frequency to potential impact, and document why a particular safeguard or exclusion is appropriate to the actual deployment.

Ownership

The platform owner maintains hardened images; security defines baseline requirements; workload owners validate compatibility.

Implementation guidance

  1. Define secure baselines and remove unnecessary services and packages.
  2. Restrict administrative access and privileged runtime features.
  3. Maintain tested update and vulnerability-remediation processes.
  4. Scan deployed state and investigate drift from approved images.

How to verify it

Use representative records and authorized controlled tests. Identify the relevant version, operating conditions and expected result before testing, and retain enough evidence to support the conclusion.

Test Expected result
Host baseline assessment Required settings are enforced.
Unnecessary privileged service It is removed or explicitly justified.
Deployed image vulnerability Remediation follows approved risk deadlines.

Record a finding when required results cannot be demonstrated or practice differs materially from the approved conditions. Missing evidence limits the conclusion; it should not be treated as a successful test.

Evidence to retain

  • Image manifests
  • Hardening assessments
  • Patch records
  • Drift findings

Protect evidence according to its sensitivity, access needs and retention rules. Avoid unnecessary copies of personal information, secrets or confidential material, while preserving the records needed for authorized review.

If the control fails

Isolate critically exposed hosts where warranted, preserve evidence and rebuild or remediate using verified images.

Example in practice

Hypothetical example: A notebook image initially includes an unused remote-access service. The hardened image removes it and runs user workloads without host-administrator privileges.

Related controls

Framework mappings

  • CSA AICM (I&S-04)
  • NIST AI RMF (MAP 1.1)
  • ISO 42001 (Cl. 8.2)

Review and maintenance

Review at the interval approved by the control owner and after relevant changes, incidents or failed assessments. Update affected procedures and configuration, address evidence gaps and verify corrective action before closing findings.

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