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Flatcar Container Linux @flatcar.org · 29/09/2026

🔐 New Flatcar maintenance security releases are out! • Alpha 4820.0.1 • Beta 4790.1.1 • Stable 4757.2.1 These releases include OpenSSL security fixes addressing multiple high-severity CVEs, along with patch-level Linux kernel updates and bug fixes. #Security #OpenSSL

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Flatcar Container Linux @flatcar.org · 14/09/2026

New Flatcar releases are out! 🚢 * Alpha 4820.0.0 * Beta 4790.1.0 * Stable 4757.2.0 This round brings kernel and runtime updates, security fixes, networking improvements, and a substantial Stable rollout.

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Flatcar Container Linux @flatcar.org · 28/08/2026

Not happy to only maintain a distro, the Flatcar Linux team has been able to forecast the #Proxmox ARM64 support by releasing Flatcar ARM64 images for Proxmox 2y ago! Give it a shot with the updated documentation: www.flatcar.org/docs/latest/... and congrats Proxmox folks for this big update.

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Flatcar Container Linux @flatcar.org · 09/07/2026

New Flatcar Container Linux releases are now available: • Beta 4722.1.0 • Stable 4593.2.4 • LTS-2024 4081.3.9 Here’s what’s included in each release. 🧵

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Flatcar Container Linux @flatcar.org · 16/06/2026

New Flatcar Alpha, Beta and Stable releases now available! 📦 Many package updates: OpenSSH, Kernel, systemd 🔒 CVE fixes & security patches 🚀Oracle Cloud Infrastructure support 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 02/06/2026

🚀 New Flatcar releases for all channels now available! 🚀 - Alpha 4694.0.1 - Beta 4628.1.2 - Stable 4593.2.2 - LTS-2024 4081.3.8 #linux #cloudnative #containers #updates

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 12/05/2026

🚨 Fresh Flatcar Alpha, Beta, and Stable releases are now out with Linux 6.12.87 and a large set of kernel security fixes. The recently disclosed Linux “Dirty Frag” privilege escalation flaws are addressed in these releases.

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Flatcar Container Linux @flatcar.org · 11/05/2026

Flatcar is unaffected by Copy Fail (CVE-2026-31431)! The kernel option causing it was never enabled, because Flatcar is minimal by design and only ships what containers need Sometimes the best mitigation is to reduce the attack surface by not shipping vulnerable components 🔒

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Flatcar Container Linux @flatcar.org · 24/04/2026

It's the last Friday of the month! 🛠️ Time for The Maintenance Mode.

Flatcar Container Linux – Maintenance Mode. A monthly community event held every last Friday of the month to fix bugs, improve docs, polish infrastructure, and tackle technical debt. Join us on HackMD and Discord.

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Flatcar Container Linux @flatcar.org · 16/04/2026

🚀 We’re happy to announce a new platform for the Flatcar community - our new Discord server! 💬 Chat with others 🎙️ Join voice discussions 🛠️ Get help and learn 🤝 Contribute and share ideas 📢 Stay up to date with everything Flatcar Join us 👉️ discord.gg/PMYjFUsJyq

discord.gg

Join the Flatcar Container Linux Discord Server!

Flatcar Container Linux is a fully open source, minimal-footprint, secure by default and always up-to-date Linux distribution for running containers at scale. | 16 members

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Flatcar Container Linux @flatcar.org · 09/03/2026

New Flatcar Alpha, Beta and Stable releases now available! 🚀 /etc is now shipped as #systemd confext 🔒 CVE fixes & security patches: CVE-2025-61984 and CVE-2025-61985 for OpenSSH on Stable 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 27/01/2026

New Flatcar Alpha, Beta and Stable releases now available! 🔒 Security patches: recent OpenSSL vulnerabilities (openssl-library.org/news/vulnera...) 📜 Release notes at the usual spot: www.flatcar.org/releases/ 📜 To learn more about this kind of security releases: www.flatcar.org/blog/2022/11...

openssl-library.org

Vulnerabilities | OpenSSL Library

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Flatcar Container Linux @flatcar.org · 18/12/2025

🚀 Flatcar Alpha 4547.0.0 released! 📦 Big updates: Linux 6.12.61, Ignition 2.24.0, Go 1.25.3, OpenSSL 3.5.4 🔒 Extensive kernel CVE fixes + coreutils, Go & PAM security updates ✨ Smaller downloads & improved security defaults

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Flatcar Container Linux @flatcar.org · 27/11/2025

📢 Fresh Flatcar releases are baked and served! Alpha 4515.0.1, Beta 4459.1.2, and Stable 4459.2.1 ship with Linux 6.12.58, kernel CVE fixes, improved system extension module loading, Nutanix support and restored SSSD components in Alpha.

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Flatcar Container Linux @flatcar.org · 20/11/2025

We are sure you remember enough your French lessons to understand this great #DevFestNantes2025 talk presenting the Flatcar #Proxmox support implementation with #enix folks! (the auto-caption works fine for those who skipped the lessons 😉) www.youtube.com/watch?v=ZMLL...

youtube.com

From Flatcar development to ProxmoxVE deployment - an example of open and sustainable collaboration

YouTube video by GDG France

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Flatcar Container Linux @flatcar.org · 18/11/2025

Grab your favorite drink, set yourself "in a meeting" and watch this last episode from @rawkode.academy about Flatcar to learn or confirm your knowledge. Thanks @rawkode.dev for the invitation and for maintaining this collection of Cloud Native interviews. www.youtube.com/watch?v=r66D...

youtube.com

Flatcar Linux: A Modern OS for the Always-On Infrastructure

YouTube video by Rawkode Academy

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Flatcar Container Linux @flatcar.org · 12/11/2025

🌅 New day, new Flatcar releases! Alpha 4515.0.0, Beta 4459.1.1, and Stable 4459.2.0 are out with Linux 6.12.54, cgroups v1 kernel config mitigations, and major security updates across the stack. #Flatcar #Linux #ContainerLinux

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Flatcar Container Linux @flatcar.org · 16/09/2025

New Flatcar releases for all channels! 📦 Many package updates: Linux, Podman, curl, etc. 🔒 CVE fixes & security patches: VMScape Spectre variant patched for Linux, etc. 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 04/09/2025

The Flatcar main repository has just reached thousand stars on GitHub. Can we all fit into a single Flatcar instance to celebrate this? The answer is yes. Thanks everyone 🌟

A SSH connection on a Flatcar instance with a thousand star emoji

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Flatcar Container Linux @flatcar.org · 20/08/2025

New Flatcar releases for all channels now available and last LTS-2023 release! 📦 Many package updates: Podman, Linux, ... 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 16/08/2025

At the #FrOSCon for the week-end? Come say "hi/hallo/bonjour !" and as we getting closer to the 1000th star on GitHub, if you star us and you are the 1000th one, come to the booth to receive your Flatcar t-shirt! github.com/flatcar/flat...

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Flatcar Container Linux @flatcar.org · 11/08/2025

Attending to #FrOSCon this year is a good opportunity to: learn about Flatcar and discuss your use-cases with some Flatcar's maintainers (at the Flatcar booth and/or during the social event). See you there! #systemd #sysext #linux #flatcar #OpenSource #DevOps

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Flatcar Container Linux @flatcar.org · 25/07/2025

July's Maintenance Mode is now ON 🟢 📷 Join us on Jitsi and start contributing to Flatcar Container Linux! There are plenty of exciting issues for grabs - pick one and dive in! 📖This time focus is on documentation. Join us & help make them better. 🔗https://meet.flatcar.org/TheMaintenanceMode

July's Maintenance Mode is live now on Jitsi! The event is an all day event on Friday, July 25, 2025. 9 AM CEST.

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Flatcar Container Linux @flatcar.org · 17/07/2025

In case you missed it, since the last release STACKIT images are now published on Alpha, Beta and Stable channels. Checkout the documentation to learn more about this freshly supported provider: www.flatcar.org/docs/latest/...

flatcar.org

Running Flatcar on STACKIT

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Flatcar Container Linux @flatcar.org · 08/07/2025

New Flatcar Alpha, Beta, Stable, and LTS-2024 releases now available! 📦 Many package updates: Linux, sudo and others 🔒 CVE fixes & security patches: sudo (CVE-2025-32462, CVE-2025-32463) 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 08/07/2025

Thanks everyone who contributed to this Friday's Flatcar Maintenance Mode: around 20 issues have been closed on Nebraska and Flatcar issue trackers (including the second oldest issue of the project!), fresh documentation has been written as well (the awaited #proxmox one!)

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Flatcar Container Linux @flatcar.org · 30/06/2025

Flatcar images for #akamai are now fully tested in CI nightlies and before a release. This coverage promotes Akamai support to an official support. Thanks to Akamai for sponsoring infra to run those tests!

flatcar.org

Running Flatcar on Akamai Connected Cloud (Linode)

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Flatcar Container Linux @flatcar.org · 27/06/2025

LTS-2023 EOL is fast approaching 🚨 LTS-2023 served us well, but its end-of-life is set for July 30th, 2025, and it's fast approaching. If you're still on this channel, please upgrade to LTS-2024 soon. For any issues, feel free to reach out to us on Matrix.

An image of LTS-2023 end-of-life on 30th July 2025 text represented as Star Wars Intro text

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Flatcar Container Linux @flatcar.org · 27/06/2025

Maintenance Mode is now ON 🟢🔘 Join us on Jitsi and start contributing to Flatcar Container Linux! There are plenty of exciting issues up for grabs - pick one and dive in! 🔗 meet.flatcar.org/TheMaintenan...

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Flatcar Container Linux @flatcar.org · 25/06/2025

📣 "Bug Smashing Fridays" is now "Maintenance Mode" and it kicks off this Friday! 🛠️ We're diving into bug triage, docs polish, and general maintenance to keep Flatcar Container Linux clean and resilient. Open source folks — join us and help shape a stronger Flatcar! 💪🐧

The Mainenance Mode announcement poster for June 27, 2025 - 10 AM IST

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Flatcar Container Linux @flatcar.org · 25/06/2025

New Flatcar Alpha, Beta, Stable releases now available! 📦 Many package updates: Linux, Go, nvidia-drivers 🔒 CVE fixes & security patches: Linux, curl, wget 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 06/06/2025

We are LIVE🔴 on Jitsi now. Join us on our Jitsi stream and help triage bugs on our Tracker. meet.flatcar.org/BugSmashingDay

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Flatcar Container Linux @flatcar.org · 05/06/2025

🗓️ Bug Smashing Friday is here! Let’s kick off the first Friday of June by stomping bugs and triaging issues in the Flatcar Container Linux tracker. Join us in cleaning up, categorizing, and closing bugs to help make Flatcar even more robust! 🔗 github.com/flatcar/Flat...

Announcement of Bug Smashing Day by Flatcar Container Linux on Friday, June 6th 2025

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Flatcar Container Linux @flatcar.org · 28/05/2025

New Flatcar Alpha 4344.0.0 release now available! 📦 Many package updates: Kernel, Docker, Containerd, Amazon SSM agent 🔒 CVE fixes & security patches 📜 Release notes at the usual spot: www.flatcar.org/releases/ 🚀 Read this thread for the new features highlight

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 06/05/2025

Announcing new Flatcar Beta, Stable and LTS-2024 maintenance releases! 📦 Package updates: Linux, ca-certificates 🔒 CVE fixes & security patches: Linux 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

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Flatcar Container Linux @flatcar.org · 27/03/2025

Announcing new Flatcar Alpha, Beta, Stable, LTS-2024, LTS-2023 releases! 🚀 New features: EROFS support for systemd-sysext, experimental secure boot 🔒 CVE fixes & security patches: Linux, intel-microcode, curl & more 📦 Package updates 📜 Release notes at the usual spot: www.flatcar.org/releases/

flatcar.org

Releases

010

Flatcar Container Linux @flatcar.org · 20/02/2025

🚨 Attention Flatcar users: We're deprecating cgroups v1 to enhance performance and security. Transition to cgroups v2 to stay updated. For more details, visit our release notes: www.flatcar.org/releases

A popular meme featuring Bernie Sanders outdoors in winter, wearing a beige parka and glasses, with a serious expression. The text at the top reads 'Flatcar maintainers:', and below, in bold white letters, it says, 'I am once again asking please note CGroups V1 deprecation.' The meme humorously references the frequent reminders about the deprecation of CGroups V1 in Flatcar Linux.

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Flatcar Container Linux @flatcar.org · 19/02/2025

OpenSSH CVE fixes are now available in the new Flatcar Alpha, Beta, Stable, LTS-2024 releases! 🔒 CVE fixes & security patches: OpenSSH (CVE-2025-26465, CVE-2025-26466) 📜 Release notes at the usual spot: www.flatcar.org/releases/

A meme featuring a scene from South Park, where a suited banker is sitting at a desk with a computer. The top text reads, 'OPENSSH CVE DISCLOSED,' and the bottom text says, 'AAAAAND ITS GONE.' This humorously references how quickly security vulnerabilities in OpenSSH are disclosed and then patched or mitigated.

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Flatcar Container Linux @flatcar.org · 17/02/2025

🚀 New Blog Post Alert! 🚀 We had an incredible time at #FOSDEM2025! From showcasing Gentoo on an Amiga to engaging with the OS community, it was an unforgettable experience. Read abbot our journey and 🐧 www.flatcar.org/blog/2025/02...

A four-panel *expanding brain* meme humorously escalating levels of involvement at FOSDEM (Free and Open Source Software Developers' European Meeting).

1. **First panel**: A dimly lit brain, representing the basic level of engagement, with the text: *"ATTENDING FOSDEM AS PARTICIPANTS."*
2. **Second panel**: A slightly more illuminated brain, symbolizing increased involvement, with the text: *"PRESENTING A TALK AT FOSDEM."*
3. **Third panel**: A glowing brain, signifying an even greater level of dedication, with the text: *"HOSTING A SHARED FLATCAR AND GENTOO BOOTH AT FOSDEM 2025."*
4. **Fourth panel**: A fully expanded, radiant brain, implying the ultimate level of mastery, with the text: *"DEMONSTRATING GENTOO RUNNING ON AN AMIGA AT THE BOOTH, ATTRACTING SIGNIFICANT ATTENTION."*

Each stage suggests increasing levels of involvement, culminating in a niche but impressive technical feat that draws admiration from FOSDEM attendees.

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Flatcar Container Linux @flatcar.org · 10/02/2025

@linusmediagroup.com's latest video -POV: When you realize deploying your own VPN can be simple and secure with Flatcar #Flatcar #VPN #LinusTechTips www.youtube.com/watch?v=St-I...

A meme featuring the 'Distracted Boyfriend' stock photo. The image shows a man labeled 'Tech Enthusiast' turning away from his girlfriend, labeled 'Complex VPN Configurations,' to look at another woman passing by, labeled 'Flatcar's Simple and Secure VPN Setup.' The caption reads: 'POV: When you realize deploying your own VPN can be simple and secure with Flatcar.

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Flatcar Container Linux @flatcar.org · 31/01/2025

Did you know the Flatcar is built from Gentoo Linux? Join Chewi a maintainer of both projects (github.com/chewi) and see how they work together. fosdem.org/2025/schedul...

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Flatcar Container Linux @flatcar.org · 30/01/2025

What does it give to mix Cluster API, systemd-sysext and immutable OS? Find out in Thilo Fromm(github.com/t-lo) talk at FOSDEM: fosdem.org/2025/schedul...

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Flatcar Container Linux @flatcar.org · 30/01/2025

Next stop: Flatcar OS on RISC-V! 🚀 Check out Adrian Vladu (github.com/ader1990) talk at #FOSDEM2025 on adding RISC-V support to your OS! 🌟 fosdem.org/2025/schedul...

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Reposted by Flatcar Container Linux

The Landscape @thelandscape.bsky.social · 22/01/2025

We spoke with Danielle Tal, Product Manager at Microsoft, about how @flatcar.org Container Linux ensures security with its immutable filesystem, automated updates, and focus on compliance. Full Episode

buff.ly

Road to KubeCon NA 2024: Danielle Tal

In this episode of The Landscape, we spoke with Danielle Tal, Product Manager at Microsoft, about Flatcar Container Linux—a secure, minimal, and immutable Li...

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Reposted by Flatcar Container Linux

Scott Lowe @scottslowe.bsky.social · 22/01/2025

Anyone know of a public example of using Ignition/Butane on @flatcar.org to bootstrap @kubernetes.io?

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Flatcar Container Linux @flatcar.org · 09/01/2025

"Flatcar was one of the projects that caught my eye at KubeCon this year. What I found interesting about it is that it is a Linux distribution tailored to run containers." virtualizationreview.com/Articles/202...

virtualizationreview.com

Hands-on with Open-Source Flatcar OS for Containers -- Virtualization Review

After it catches his attention at KubeCon, where it was accepted by the Cloud Native Computing Foundation as an incubating project, Tom Fenton puts it through its paces.

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Flatcar Container Linux @flatcar.org · 20/12/2024

🎄With the holidays upon us, all of us on the Flatcar team wish you a secure, immutable Christmas and a declaratively provisioned New Year!

ascii art scene of a train pulling up to a Christmas tree, with the message "Wishing you a secure, immutable Christmas and a declaratively provisioned New Year! - Your Flatcar Container Linux Team"

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Reposted by Flatcar Container Linux

Lachlan Evenson @lachie.bsky.social · 18/12/2024

Great opportunity to join the Kubernetes release team and learn what it takes to ship Kubernetes!

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Flatcar Container Linux @flatcar.org · 17/12/2024

❗ Heads-up, this latest Flatcar Stable release will graduate to LTS in early 2025!

London underground whiteboard sign: "the next Flatcar LTS will arrive on platform 1 in early 2025, based on the latest Stable release"

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