# Cis Ubuntu1204 V110 2 16

> Add noexec Option to /run/shm Partition

- Skill: `cyberstrikeus/cis-ubuntu1204-v110-2-16` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu1204-v110-2-16`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu1204-v110-2-16/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-ubuntu1204-v110-2-16

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# 2.16 Add noexec Option to /run/shm Partition (Scored)

## Profile Applicability

- Level 1

## Description

Set `noexec` on the shared memory partition to prevent programs from executing from there.

## Rationale

Setting this option on a file system prevents users from executing programs from shared memory. This deters users from introducing potentially malicious software on the system.

## Audit Procedure

### Using Command Line

```bash
grep /run/shm /etc/fstab | grep noexec
mount | grep /run/shm | 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). Look for entries that have mount points that contain `/run/shm`. See the `fstab(5)` manual page for more information.

```bash
mount -o remount,noexec /run/shm
```

## Default Value

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

## References

- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

## Profile

Level 1 - Scored