# Cis Docker 3.24

> Ensure that the Containerd socket file permissions are set to 660 or more restrictively

- Skill: `cyberstrikeus/cis-docker-3-24` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-docker-3-24`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-docker-3-24/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-docker-3-24

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# Ensure that the Containerd socket file permissions are set to 660 or more restrictively (Automated)

## Profile Applicability

- Level 1 - Docker - Linux

## Description

You should verify that the Containerd socket file has permissions of `660` or are configured more restrictively.

## Rationale

Only `root` and the members of the `root` group should be allowed to read and write to the default Containerd Unix socket. The Containerd socket file should therefore have permissions of `660` or more restrictive permissions.

## Impact

None.

## Audit Procedure

You should execute the command below to verify that the Docker socket file has permissions of `660` or more restrictive permissions

```bash
stat -c %a /run/containerd/containerd.sock
```

## Remediation

You should execute the command below.

```bash
chmod 660 /run/containerd/containerd.sock
```

This sets the file permissions of the Containerd socket file to `660`.

## Default Value

By default, the permissions for the Containerd socket file is correctly set to `660`.

## References

None specified in benchmark.

## CIS Controls

| Controls Version | Control                                                                                                                                                                                                                                         | IG 1 | IG 2 | IG 3 |
| ---------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- |
| v8               | 3.3 Configure Data Access Control Lists - Configure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications. | ●    | ●    | ●    |