Fedora Atomic Desktops (Silverblue, Kinoite, and others) are immutable Fedora variants where the base OS is read-only and updated atomically via rpm-ostree. Applications run as Flatpaks, and rollback to a prior OS image is built in.
Fedora Atomic Desktops
fedoraproject.org/atomic-desktops
Our take
Immutability changes the threat model in a meaningful way: a compromised package or a bad system update cannot silently alter the base OS, and rolling back is a single command rather than a reinstall. Fedora’s position close to upstream and Red Hat’s engineering backing means SELinux is on by default and the tooling is polished. The honest friction point is the Flatpak-centric workflow: traditional RPM package installs go into layered overlays that complicate the image, so this design suits users willing to embrace Flatpak or containers. A natural upgrade path for anyone on standard Fedora Workstation who wants more resilience without leaving the ecosystem.
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Fedora Atomic Desktops alternatives
Qubes OS Qubes OS: A reasonably secure operating system
Tails Tails: Portable, encrypted and secure through the Tor network
Whonix A free, open-source desktop operating system that forces all traffic through Tor, run as two isolated virtual machines.
secureblue secureblue is a security-hardened immutable Linux OS built on Fedora Atomic Desktops. It ships as OCI bootable container images and applies kernel hardening, a hardened memory allocator from GrapheneOS, and a hardened Chromium browser called Trivalent.
Kicksecure Kicksecure is a security-hardened Debian-based Linux distribution that applies a broad set of kernel and userspace hardening settings out of the box, reducing the attack surface without requiring manual configuration. It also serves as the foundation for the Whonix anonymity OS.
NixOS NixOS is a Linux distribution built entirely on the Nix package manager, where the whole system (kernel, packages, services, and configuration) is declared in a single set of files. Upgrades are atomic and fully reproducible rollbacks are a built-in feature.