Flatcar Container Linux

🚀 New Flatcar Beta, Stable & LTS releases are out! 🔒 Security fixes: Kernel (PwnEscape, InfinityCore Timer) & Go CA certificates 📦 Updates: Go 1.26.10, ca-certificates 3.131.1 Keep your nodes up to date! 📜 www.flatcar.org/releases/ #Flatcar #Linux

🔐 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

If you’re running Flatcar, please update your workloads to the latest release for your channel. 📜 Release notes in the usual spot: www.flatcar.org/releases/ #Flatcar #Linux

14 Sept

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.

14 Sept

Highlights: 🧪 Alpha: Ignition 2.27.0, Linux 6.12.109 + better early-boot networking. 🛠 Beta: Linux 6.12.109, Docker 29.1.3 + Podman 6.0.0. ✅ Stable: OCI images + signed sysexts; Equinix Metal and Rackspace support removed.

14 Sept

Releases in the usual place: www.flatcar.org/releases/

28 Aug

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.

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. 🧵

Stable 4593.2.4 includes: • Linux 6.12.95 • Updated CA certificates • Security fixes for the Linux kernel LTS-2024 4081.3.9 includes: • Linux 6.6.144 • Updated CA certificates • Linux kernel security fixes

View the complete release notes and download the latest Flatcar releases on our (awesomely refactored) release page: www.flatcar.org/releases #Flatcar #ContainerLinux #CloudNative #Linux

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. 🧵

Beta 4722.1.0 adds Oracle Cloud Infrastructure images, Exoscale-compatible 10 GB QCOW2 images, and refreshed VirtualBox and Vagrant support. It also includes Linux 6.12.95, containerd 2.2.2, Docker CLI 29.1.3, bug fixes, and security updates.

16 June

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/

2 June

🚀 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

2 June

📦 Package updates: Linux 6.12.91 (Alpha/Beta/Stable), Linux 6.6.141 (LTS), ca-certificates 3.124 🔒 Security maintenance release for the recently disclosed kernel LPEs Fragnesia (CVE-2026-46300) and ssh-keysign-pwn (CVE-2026-46333), plus the usual kernel CVE roll-up

2 June

📜 Release notes at the usual spot: www.flatcar.org/releases/

🚨 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.

🚀 Alpha 4694.0.0 ⚙️ Beta 4628.1.1 🛡️ Stable 4593.2.1 Highlights: • Linux 6.12.87 • Kernel security fixes • EROFS tools for containerd • OEM partition mount rework • ARM64 QEMU/KVM VNC serial logging • Updated firmware & CA certs

📜 Releases in the usual place: www.flatcar.org/releases/

🛡️ Flatcar was not affected by the “Copy Fail” issue because the vulnerable kernel option CONFIG_CRYPTO_USER_API_AEAD was never enabled.

11 May

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 🔒

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

Throughout the day, we target action items and work through them in order. We welcome contributors from the community to join in, collaborate, and help us make Flatcar better together. 🤝

📝 Notes on HackMD: hackmd.io/@fNE1Ey0YRB-... 🎙️ Video/Voice Bridge: discord.gg/xBk4JFvrM?ev... Join us and start your contribution journey in Flatcar! 🐧

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

Maintenance Mode is our dedicated monthly Friday ritual to focus on internal quality work -- fixing bugs, improving docs, polishing infra, and tackling technical debt to keep Flatcar healthy, maintainable, and sharp.

discord.ggJoin 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

16 Apr

🚀 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

9 Mar

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/

openssl-library.org Vulnerabilities | OpenSSL Library

27 Jan

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...

🚀 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

✅ Flatcar Stable 4459.2.2 available now! 📦 Linux updated to 6.12.61 with latest ca-certificates 🔒 Security-focused release with a large Linux kernel CVE fix set 🛡️ Recommended update for all Stable users

Releases in the usual place: flatcar.org/releases/

🧪 Flatcar Beta 4515.1.0 is out! 📦 Updated to Linux 6.12.61 + refreshed ca-certificates 🔒 Major Linux kernel CVE rollup and multiple userspace security fixes ✨ New minimal first-stage initrd & larger partitions (from Alpha)

27 Nov 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.

27 Nov 2025

🛡️ Stable: Linux 6.12.58 + udev fix for module loading ⚙️ Beta: Same kernel & fixes as Stable 🚀 Alpha: Adds back missing LDB modules (fixes SSSD) + improved sysext module loading 📜 Releases in the usual place: www.flatcar.org/releases/

youtube.comFrom Flatcar development to ProxmoxVE deployment - an example of open and sustainable collaborationYouTube video by GDG France

20 Nov 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.comFlatcar Linux: A Modern OS for the Always-On InfrastructureYouTube video by Rawkode Academy

18 Nov 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...

🌅 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

🚀 Alpha 4515.0.0 → runc vuln fixes ✅, plus OpenSSH/OpenSSL/Intel/NVIDIA CVEs, Azure image shrunk to 30 GB, Fusion SCSI disk drivers are back, and refreshed SDK & firmware.

📜 Releases in the usual place: www.flatcar.org/releases/ #Flatcar #ContainerLinux #Release

🛡️ Stable 4459.2.0 → runc vuln fixes ✅ + Linux 6.12.54, new overlaybd sysext, Hyper-V using systemd-sysext layering, cgroups v1 mitigation, and CVE patches for OpenSSH, OpenSSL, curl, git, libxml2, NVIDIA, Intel µcode & more.

⚙️ Beta 4459.1.1 → runc vuln fixes ✅, kernel CVE fixes, DHCP/TUN-TAP conflict fix, cgroups v1 mitigation, and improved Intel µcode handling.

🚨 All channels include critical fixes for runc vulnerabilities - CVE-2025-31133, CVE-2025-52565, CVE-2025-52881. Update soon to stay safe! #Flatcar #Security #runc

16 Sept 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/

4 Sept 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 🌟

20 Aug 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/

16 Aug 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...

11 Aug 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

programm.froscon.orgLecture: Immutable Turtles All the Way Down | Saturday | Schedule FrOSCon 2025

11 Aug 2025

On Saturday 16th 6:15pm, fromm.social/@thilo will demo Kubernetes deployment using Flatcar and systemd-sysext and how to handle the updates. programm.froscon.org/2025/events/... #systemd #sysext #linux #flatcar #OpenSource #DevOps #FrOSCon

programm.froscon.orgWorkshop: Extending image based systems using Systemd system extensions | Sunday | Schedule FrOSCon 2025

11 Aug 2025

On Sunday 17th 4:00pm, fosstodon.org/@tormath1 will run a workshop to learn how to run, build and update systemd-sysext images on image based systems. programm.froscon.org/2025/events/... #systemd #sysext #linux #flatcar #OpenSource #DevOps #FrOSCon

25 July 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