# Cis Ubuntu1604 V200 1 1 1 3

> Ensure mounting of jffs2 filesystems is disabled

- Skill: `cyberstrikeus/cis-ubuntu1604-v200-1-1-1-3` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1604-v200-1-1-1-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1604-v200-1-1-1-3/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-ubuntu1604-v200-1-1-1-3

---


# Ensure mounting of jffs2 filesystems is disabled

## Description

The jffs2 (journaling flash filesystem 2) filesystem type is a log-structured filesystem used in flash memory devices.

## Rationale

Removing support for unneeded filesystem types reduces the local attack surface of the system. If this filesystem type is not needed, disable it.

## Impact

None noted.

## Audit Procedure

### Command Line

```bash
# modprobe -n -v jffs2 | grep -E '(jffs2|install)'
# lsmod | grep jffs2
```

## Expected Result

```
install /bin/true
```

The `lsmod` command should return no output.

## Remediation

### Command Line

```bash
# Edit or create a file in the /etc/modprobe.d/ directory ending in .conf
# Example: vi /etc/modprobe.d/jffs2.conf
# and add the following line:
install jffs2 /bin/true

# Run the following command to unload the jffs2 module:
rmmod jffs2
```

## Default Value

Not disabled by default.

## References

- CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.

## Profile

Level 1 - Server / Level 1 - Workstation, Assessment: Automated