List of security-focused operating systems

This is a list of operating systems specifically focused on security. Similar concepts include security-evaluated operating systems that have achieved certification from an auditing organization, and trusted operating systems that provide sufficient support for multilevel security and evidence of correctness to meet a particular set of requirements.

Linux

Android-based

GrapheneOS is a security-focused, Android-based mobile OS that uses a hardened kernel, C library, custom memory allocator (hardened_malloc), and a hardened Chromium-based browser named Vanadium. It also offers privacy/security features, such as Duress PIN/Password or disabling the USB-C port at a driver/hardware level to avoid exploitation. It deploys exploit mitigations such as hardware-based memory tagging, secure app spawning, restricted dynamic code loading, and more.

Debian-based

Linux Kodachi is a security-focused operating system.
Tails is aimed at preserving privacy and anonymity.
KickSecure is a security-focused Linux distribution that aims to be "hardened by default". It uses network hardening, kernel hardening, Strong Linux User Account Isolation, better randomness, root access restrictions, and app-specific hardening.
Whonix is an anonymity focused operating system based on KickSecure. It consists of two virtual machines, And all communications are routed through Tor.

Other Linux distributions

Alpine Linux is designed to be small, simple, and secure. It uses musl, BusyBox, and OpenRC instead of the more commonly used glibc, GNU Core Utilities, and systemd.
Owl - Openwall GNU/Linux, a security-enhanced Linux distribution for servers.
Secureblue, a Fedora Atomic based distro that uses a hardened kernel, custom memory allocator (hardened_malloc), Trivalent, a security-focused, Chromium-based browser inspired by Vanadium, and many other exploit mitigations.

BSD

OpenBSD is a Unix-like operating system that emphasizes portability, standardization, correctness, proactive security, and integrated cryptography.

Xen

Qubes OS aims to provide security through isolation. Isolation is provided through the use of virtualization technology. This allows the segmentation of applications into secure virtual machines.

References

↑ "Features overview | GrapheneOS". grapheneos.org. Retrieved 31 March 2026.
↑ Choudhury, Ambika (4 June 2019). "10 Most Secured Linux Distros For Advanced Privacy & Security". AIM. Retrieved 1 November 2024.
↑ Vervloesem, Koen (27 April 2011). "The Amnesic Incognito Live System: A live CD for anonymity [LWN.net]". lwn.net. Archived from the original on 21 August 2017. Retrieved 14 June 2017.
↑ "Kicksecure - A Security Hardened Linux Distribution". Kicksecure. 29 January 2026. Retrieved 31 March 2026.
↑ "Devs cook up 'leakproof' all-Tor untrackable platform". The Register. 13 November 2012. Retrieved 10 July 2014.
↑ Greenburg, Andy (17 June 2014). "How to Anonymize Everything You Do Online". Wired. Retrieved 10 July 2014.
↑ "Whonix adds a layer of anonymity to your business tasks". TechRepublic. 4 January 2013. Retrieved 10 July 2014.
↑ "about | Alpine Linux". alpinelinux.org.
↑ says, GigaTux (24 August 2010). "Alpine Linux 2 review | LinuxBSDos.com".
↑ "Features | secureblue". secureblue.dev. Retrieved 31 March 2026.
↑ OpenBSD Project (19 May 2020). "OpenBSD". OpenBSD.org. Retrieved 12 October 2020.
↑ "Qubes OS bakes in virty system-level security". The Register. 5 September 2012.

[1] "Features overview | GrapheneOS". grapheneos.org. Retrieved 31 March 2026.

[2] Choudhury, Ambika (4 June 2019). "10 Most Secured Linux Distros For Advanced Privacy & Security". AIM. Retrieved 1 November 2024.

[3] Vervloesem, Koen (27 April 2011). "The Amnesic Incognito Live System: A live CD for anonymity [LWN.net]". lwn.net. Archived from the original on 21 August 2017. Retrieved 14 June 2017.

[4] "Kicksecure - A Security Hardened Linux Distribution". Kicksecure. 29 January 2026. Retrieved 31 March 2026.

[5] "Devs cook up 'leakproof' all-Tor untrackable platform". The Register. 13 November 2012. Retrieved 10 July 2014.

[6] Greenburg, Andy (17 June 2014). "How to Anonymize Everything You Do Online". Wired. Retrieved 10 July 2014.

[7] "Whonix adds a layer of anonymity to your business tasks". TechRepublic. 4 January 2013. Retrieved 10 July 2014.

[8] "about | Alpine Linux". alpinelinux.org.

[9] says, GigaTux (24 August 2010). "Alpine Linux 2 review | LinuxBSDos.com".

[10] "Features | secureblue". secureblue.dev. Retrieved 31 March 2026.

[11] OpenBSD Project (19 May 2020). "OpenBSD". OpenBSD.org. Retrieved 12 October 2020.

[12] "Qubes OS bakes in virty system-level security". The Register. 5 September 2012.

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