# CIS Ubuntu 14.04 LTS - 1.6.2.1 Ensure AppArmor is not disabled in bootloader configuration

> Verify that AppArmor is not disabled via GRUB bootloader parameters

- Skill: `cyberstrikeus/cis-ubuntu-14-04-lts-1-6-2-1-ensure-apparmor-is-not-disabled` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu-14-04-lts-1-6-2-1-ensure-apparmor-is-not-disabled`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu-14-04-lts-1-6-2-1-ensure-apparmor-is-not-disabled/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-1-6-2-1-ensure-apparmor-is-not-disabled

---


# 1.6.2.1 Ensure AppArmor is not disabled in bootloader configuration (Scored)

## Profile Applicability

- Level 2 - Server
- Level 2 - Workstation

## Description

Configure AppArmor to be enabled at boot time and verify that it has not been overwritten by the bootloader boot parameters.

## Rationale

AppArmor must be enabled at boot time in your bootloader configuration to ensure that the controls it provides are not overridden.

## Audit Procedure

Run the following command and verify that no linux line the `apparmor=0` parameter set:

```bash
grep "^\s*linux" /boot/grub/grub.cfg
```

## Expected Result

No linux lines should contain `apparmor=0`.

## Remediation

Edit `/etc/default/grub` and remove all instances of `apparmor=0` from all CMDLINE_LINUX parameters:

```
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""
```

Run the following command to update the grub2 configuration:

```bash
update-grub
```

## Default Value

AppArmor is enabled by default on Ubuntu systems.

## Notes

This recommendation is designed around the grub bootloader, if LILO or another bootloader is in use in your environment enact equivalent settings.

## References

1. AppArmor Documentation: http://wiki.apparmor.net/index.php/Documentation
2. Ubuntu AppArmor Documentation: https://help.ubuntu.com/community/AppArmor
3. SUSE AppArmor Documentation: https://www.suse.com/documentation/apparmor/

## Profile

- Level 2 - Server
- Level 2 - Workstation