# CIS Ubuntu 14.04 LTS - 1.1.15 Ensure nosuid option set on /run/shm partition

> Ensure nosuid option is set on /run/shm partition to prevent privileged programs

- Skill: `cyberstrikeus/cis-ubuntu-14-04-lts-1-1-15-ensure-nosuid-option-set-on-run-` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu-14-04-lts-1-1-15-ensure-nosuid-option-set-on-run-`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu-14-04-lts-1-1-15-ensure-nosuid-option-set-on-run-/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-1-1-15-ensure-nosuid-option-set-on-run-

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# 1.1.15 Ensure nosuid option set on /run/shm partition (Scored)

## Profile Applicability

- Level 1 - Server
- Level 1 - Workstation

## Description

The nosuid mount option specifies that the filesystem cannot contain setuid files.

## Rationale

Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.

## Audit Procedure

```bash
mount | grep /run/shm
# Verify that the nosuid option is set on /run/shm
# Expected output: tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
```

## Expected Result

The output should show the `nosuid` option is set for the /run/shm partition.

## Remediation

```bash
# Edit the /etc/fstab file and add nosuid to the fourth field (mounting options)
# for the /run/shm partition. See the fstab(5) manual page for more information.

# Run the following command to remount /run/shm:
mount -o remount,nosuid /run/shm
```

## Default Value

By default, the nosuid option is not set on /run/shm.

## References

- CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0

## Profile

- Level 1