# Cis Ubuntu1204 V110 2 4

> Set noexec option for /tmp Partition

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-2-4` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-2-4`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-2-4/raw
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- 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-ubuntu1204-v110-2-4

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# 2.4 Set noexec option for /tmp Partition (Scored)

## Profile Applicability

- Level 1

## Description

The `noexec` mount option specifies that the filesystem cannot contain executable binaries.

## Rationale

Since the `/tmp` filesystem is only intended for temporary file storage, set this option to ensure that users cannot run executable binaries from `/tmp`.

## Audit Procedure

### Using Command Line

```bash
grep /tmp /etc/fstab | grep noexec
mount | grep /tmp | grep noexec
```

## Expected Result

Both commands should return output showing `noexec` is set. If either command emits no output then the system is not configured as recommended.

## Remediation

### Using Command Line

Edit the `/etc/fstab` file and add `noexec` to the fourth field (mounting options). See the `fstab(5)` manual page for more information.

```bash
mount -o remount,noexec /tmp
```

## Default Value

By default, the `noexec` option is not set on the `/tmp` partition.

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored