First screen, captured 2 days ago. Open the video.

Greg Kurtzer's Ginux is now a userspace kernel

What HN thinks

A new kernel is born, pivots, and is promptly asked why it isn't User-mode Linux.

Why not User-mode Linux or namespaces?
Several commenters question reinventing the wheel when User-mode Linux, rootless namespaces and gVisor already exist, with better compatibility.
Smaller attack surface is worthwhile
Others argue a userspace kernel like gVisor exposes far less of Linux's huge attack surface, adding a defense-in-depth layer that matters more now that AI agents need sandboxing.
AI-built pivot project, not serious
Skeptics dismiss it as AI slop or a short-lived toy that already pivoted once, while defenders note Kurtzer's Rocky Linux credentials and that heterogeneity can help security.

Consensus: No real consensus; most agree it resembles gVisor more than UML and that its value depends on how much it actually shields the host kernel.

Recommended in the comments

gVisor (tool): Cited as the mature, widely used userspace kernel with nearly a decade of compatibility work.
User-mode Linux ↗ (tool): Suggested as an existing option offering the full Linux API.
Firecracker (tool): Mentioned as offering stronger isolation guarantees than userspace kernels.
Atmosphere ↗ (other): Pointed to as an interesting formally verified kernel project.

Summarised by Claude from the comment thread 2 days ago.

Points: 110
Comments: 71
Best rank: #2
Posted: 2026-11-11 by d3Xt3r
Category: Programming

ginux userspace-kernel rust linux syscall-sandboxing ai-coding-agents greg-kurtzer

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