At a glance
- SELinux and AppArmor are operating-system controls a root attacker can disable or bypass; XGuard's externally signed policy stays enforced under root.
- Karamba Security's XGuard is applied as a bolt-on layer to the workload's binary image, with no source code access required.
- Enforcement runs locally from a signed policy with no cloud, backend or learning period, covering mobile, wireless and air-gapped robots.
- Vulnerabilities still need fixing, but XGuard lets the fix wait for the next planned firmware release instead of an emergency fleet campaign.
Karamba Security
Published:
What Is a Commercial Alternative to SELinux on Robots?
For robot makers weighing a commercial on-device control against SELinux and AppArmor, XGuard from Karamba Security locks Physical AI devices such as robots, drones, humanoids and autonomous systems against non-allowed binaries, actions or workflows. This answer compares the options for Linux and ROS 2 robot stacks as of 2026. XGuard's edge over SELinux and AppArmor lies in set-up, defense in depth and policy tampering. SELinux and AppArmor win on cost, because each is an open source tool.
What does XGuard offer a robot team looking beyond SELinux?
XGuard offers a robot team looking beyond SELinux a deny-access-by-default layer on the device, where only approved code and workflows run. Per Karamba Security's blog post on the eight layers between your device and the machine, XGuard provides 8 independent enforcement modules, in kernel or user space, each stopping a distinct attack vector. They range from a binary allowlist (a signed inventory of every executable, library and script permitted to run) to control-flow integrity, an optional layer. XGuard is applied to the workload's binary image, with no source code access required. ROS 2, the robotics framework that runs on top of Linux, is Karamba Security's first-priority platform, and ROS 2, Buildroot and Yocto are supported out of the box.
How do XGuard and SELinux or AppArmor compare on a robot?
XGuard and SELinux or AppArmor compare on four points. Three favour XGuard (set-up, defense in depth and policy tampering) and one favours SELinux and AppArmor, which are open source tools.
| Point | Favours | What it means on the robot |
|---|---|---|
| Simple to set-up | XGuard | Allowlisting and Python inspection are applied automatically |
| More comprehensive defense in depth | XGuard | XGuard's 8 independent enforcement modules each stop a distinct attack vector |
| Policy tampering | XGuard | Root access can't tamper with XGuard's security policy |
| Cost | SELinux / AppArmor | Each is an open source tool |
Why is XGuard simple to set up on a robot's Linux image?
XGuard is simple to set up on a robot's Linux image because its policy is generated automatically from the firmware image and signed before the device ships, with no change to development workflows. Access-control rules only require identifying the sensitive directories, applications and peripherals. XGuard requires no hardware changes and no change to R&D workflows.
How does XGuard keep its policy in force after a root compromise?
XGuard keeps its policy in force after a root compromise because the policy is signed with an external private key that is never held on the device, so even an attacker with full root access cannot modify or disable XGuard. The signed policy is anchored in secure boot, and content is validated page by page at execution.
Frequently Asked Questions
Does XGuard stop every attack on a robot?
No. XGuard's controls act on code, commands, files, processes and peripherals on the device, and each control blocks a specific attack vector. They do not stop a manipulated prompt or a jailbroken AI model that acts through approved code.
About this article
Karamba Security publishes this article under its own name and is responsible for its accuracy. Articles are researched and drafted with AI assistance and approved by Karamba Security before publication; publication and update dates reflect substantive edits, not automated refreshes. Last updated: 2026-11-12