# CIS Ubuntu 14.04 LTS - 1.1.1.6 Ensure mounting of udf filesystems is disabled

> Ensure the udf filesystem type is disabled to reduce attack surface

- Skill: `cyberstrikeus/cis-ubuntu-14-04-lts-1-1-1-6-ensure-mounting-of-udf-filesyst` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu-14-04-lts-1-1-1-6-ensure-mounting-of-udf-filesyst`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu-14-04-lts-1-1-1-6-ensure-mounting-of-udf-filesyst/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-ubuntu-14-04-lts-1-1-1-6-ensure-mounting-of-udf-filesyst

---


# 1.1.1.6 Ensure mounting of udf filesystems is disabled (Scored)

## Profile Applicability

- Level 1 - Server
- Level 1 - Workstation

## Description

The udf filesystem type is the universal disk format used to implement ISO/IEC 13346 and ECMA-167 specifications. This is an open vendor filesystem type for data storage on a broad range of media. This filesystem type is necessary to support writing DVDs and newer optical disc formats.

## Rationale

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

## Audit Procedure

```bash
modprobe -n -v udf
# Expected output: install /bin/true

lsmod | grep udf
# Expected output: <No output>
```

## Expected Result

`modprobe -n -v udf` should return `install /bin/true` and `lsmod | grep udf` should return no output.

## Remediation

```bash
# Edit or create the file /etc/modprobe.d/CIS.conf and add the following line:
echo "install udf /bin/true" >> /etc/modprobe.d/CIS.conf

# Unload the udf module:
rmmod udf
```

## Default Value

By default, udf filesystem mounting is allowed.

## References

- CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
- CIS Controls: 13 Data Protection

## Profile

- Level 1