# Cis K8S V1120 5.6.4

> The default namespace should not be used (Manual)

- Skill: `cyberstrikeus/cis-k8s-v1120-5-6-4` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-k8s-v1120-5-6-4`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-k8s-v1120-5-6-4/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-k8s-v1120-5-6-4

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# 5.6.4 The default namespace should not be used (Manual)

## Profile Applicability

- Level 2 - Master Node

## Description

Kubernetes provides a default namespace, where objects are placed if no namespace is specified for them. Placing objects in this namespace makes application of RBAC and other controls more difficult.

## Rationale

Resources in a Kubernetes cluster should be segregated by namespace, to allow for security controls to be applied at that level and to make it easier to manage resources.

## Impact

None

## Audit Procedure

Run this command to list objects in default namespace:

```bash
kubectl get $(kubectl api-resources --verbs=list --namespaced=true -o name | paste -sd, -) --ignore-not-found -n default
```

The only entries there should be system managed resources such as the `kubernetes` service.

## Remediation

Ensure that namespaces are created to allow for appropriate segregation of Kubernetes resources and that all new resources are created in a specific namespace.

## Default Value

Unless a namespace is specific on object creation, the `default` namespace will be used.

## CIS Controls

| Controls Version | Control                                                   | IG 1 | IG 2 | IG 3 |
| ---------------- | --------------------------------------------------------- | ---- | ---- | ---- |
| v8               | 12.2 Establish and Maintain a Secure Network Architecture |      | X    | X    |