Understanding Linux namespaces
This technical white paper aims to move beyond the ‘black box’ abstraction to explore the Linux kernel primitives that ensure the isolation and security of containerised environments.
Containerisation has revolutionised modern software deployment, yet its core security and isolation rely heavily on fundamental Linux kernel features. This technical white paper by Airbus Protect explores Linux namespaces—the essential kernel technology that partitions system resources such as process trees, network interfaces, mount points, and user IDs. By examining how namespaces interact with Control Groups (cgroups) and security controls, the paper explains how modern container engines achieve lightweight virtualisation. Furthermore, it outlines potential isolation escapes, privilege escalation risks, and security hardening practices necessary to ensure robust tenant separation in cloud-native environments.
What you will find
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Core Namespace Types & Mechanics: A detailed overview of Mount, PID, Network, IPC, UTS, User, and Cgroup namespaces and their role in resource isolation.
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Kernel-Level Virtualisation vs. Security: How namespaces create isolated environments without the performance overhead of full hardware virtualisation.
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Attack Vectors & Container Escapes: Analysis of common misconfigurations, shared kernel vulnerabilities, and privilege escalation vectors within containerised environments.
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Hardening & Best Practices: Actionable guidelines for applying principle-of-least-privilege, leveraging User Namespaces, and configuring security profiles (e.g. Seccomp, AppArmor) to prevent isolation breaches.