Microsoft has released an experimental open-source library OS designed to sandbox applications while reducing their exposure to host systems.

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Microsoft open-sourced LiteBox, an experimental library OS written in Rust that provides application sandboxing with minimal attack surface. Unlike containers that share host kernels or VMs that bundle full kernels, LiteBox uses a library OS model with narrow interfaces. It features a split architecture with North (POSIX system calls) and South (host connection) interfaces, supports AMD SEV-SNP for confidential computing, and can run unmodified Linux applications across different platforms. The project is experimental and not production-ready, positioning itself as a middle ground between containers and VMs for scenarios requiring stronger isolation without heavy overhead.

Microsoft Unveils LiteBox, a Rust-Based Approach to Secure Sandboxing