Flatcar Container Linux Release - November 24th, 2025

# Flatcar Container Linux Release - November 24th, 2025 ## Alpha 4515.0.1 - AMD64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal - ARM64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal ## Beta 4459.1.2 - AMD64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal - ARM64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal ## Stable 4459.2.1 - AMD64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal - ARM64-usr - Platforms succeeded: All - Platforms failed: None - Platforms not tested: Equinix Metal VERDICT: _GO_ ## Communication --- #### Guidelines / Things to Remember - Release notes are used in a PR and will appear on https://www.flatcar.org/releases/ - [Announcement Message](#Announcement-Message) is posted in [Flatcar-Linux-user](https://groups.google.com/g/flatcar-linux-user). Make sure to post as “Flatcar Container Linux User”, not with your personal user (this can be selected when drafting the post). - Make sure the the LTS is referred to as `LTS-2021`, and not `LTS-2605` --- ### Announcement Message Subject: Announcing new releases Alpha 4515.0.1, Beta 4459.1.2, Stable 4459.2.1 Hello, We are pleased to announce a new Flatcar Container Linux release for the Alpha, Beta and Stable channels. #### New Alpha Release 4515.0.1 _Changes since **Alpha 4515.0.0**_ #### Security fixes: - Linux ([CVE-2025-40177](https://nvd.nist.gov/vuln/detail/CVE-2025-40177), [CVE-2025-40176](https://nvd.nist.gov/vuln/detail/CVE-2025-40176), [CVE-2025-40172](https://nvd.nist.gov/vuln/detail/CVE-2025-40172), [CVE-2025-40173](https://nvd.nist.gov/vuln/detail/CVE-2025-40173), [CVE-2025-40166](https://nvd.nist.gov/vuln/detail/CVE-2025-40166), [CVE-2025-40167](https://nvd.nist.gov/vuln/detail/CVE-2025-40167), [CVE-2025-40165](https://nvd.nist.gov/vuln/detail/CVE-2025-40165), [CVE-2025-40162](https://nvd.nist.gov/vuln/detail/CVE-2025-40162), [CVE-2025-40133](https://nvd.nist.gov/vuln/detail/CVE-2025-40133), [CVE-2025-40095](https://nvd.nist.gov/vuln/detail/CVE-2025-40095), [CVE-2025-40094](https://nvd.nist.gov/vuln/detail/CVE-2025-40094), [CVE-2025-40093](https://nvd.nist.gov/vuln/detail/CVE-2025-40093), [CVE-2025-40092](https://nvd.nist.gov/vuln/detail/CVE-2025-40092), [CVE-2025-40090](https://nvd.nist.gov/vuln/detail/CVE-2025-40090), [CVE-2025-40088](https://nvd.nist.gov/vuln/detail/CVE-2025-40088), [CVE-2025-40105](https://nvd.nist.gov/vuln/detail/CVE-2025-40105), [CVE-2025-40104](https://nvd.nist.gov/vuln/detail/CVE-2025-40104), [CVE-2025-40103](https://nvd.nist.gov/vuln/detail/CVE-2025-40103), [CVE-2025-40101](https://nvd.nist.gov/vuln/detail/CVE-2025-40101), [CVE-2025-40100](https://nvd.nist.gov/vuln/detail/CVE-2025-40100), [CVE-2025-40099](https://nvd.nist.gov/vuln/detail/CVE-2025-40099), [CVE-2025-40096](https://nvd.nist.gov/vuln/detail/CVE-2025-40096), [CVE-2025-40087](https://nvd.nist.gov/vuln/detail/CVE-2025-40087), [CVE-2025-40085](https://nvd.nist.gov/vuln/detail/CVE-2025-40085), [CVE-2025-40040](https://nvd.nist.gov/vuln/detail/CVE-2025-40040), [CVE-2025-40106](https://nvd.nist.gov/vuln/detail/CVE-2025-40106), [CVE-2025-40084](https://nvd.nist.gov/vuln/detail/CVE-2025-40084), [CVE-2025-40211](https://nvd.nist.gov/vuln/detail/CVE-2025-40211), [CVE-2025-40209](https://nvd.nist.gov/vuln/detail/CVE-2025-40209)) #### Bug fixes: - Fixed SSSD startup failure by adding back LDB modules into the image, which got lost after a Samba update ([Flatcar#1919](https://github.com/flatcar/Flatcar/issues/1919)) - Fixed the loading of kernel modules from system extensions via udev (e.g. at boot time).([flatcar/scripts#3367](https://github.com/flatcar/scripts/pull/3367)) #### Changes: - Added Nutanix images ([flatcar/scripts#3311](https://github.com/flatcar/scripts/pull/3311)) #### Updates: - Linux ([6.12.58](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.58) (includes [6.12.57](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.57), [6.12.56](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.56), [6.12.55](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.55))) #### New Beta Release 4459.1.2 _Changes since **Beta 4459.1.1**_ #### Security fixes: - Linux ([CVE-2025-40177](https://nvd.nist.gov/vuln/detail/CVE-2025-40177), [CVE-2025-40176](https://nvd.nist.gov/vuln/detail/CVE-2025-40176), [CVE-2025-40172](https://nvd.nist.gov/vuln/detail/CVE-2025-40172), [CVE-2025-40173](https://nvd.nist.gov/vuln/detail/CVE-2025-40173), [CVE-2025-40166](https://nvd.nist.gov/vuln/detail/CVE-2025-40166), [CVE-2025-40167](https://nvd.nist.gov/vuln/detail/CVE-2025-40167), [CVE-2025-40165](https://nvd.nist.gov/vuln/detail/CVE-2025-40165), [CVE-2025-40162](https://nvd.nist.gov/vuln/detail/CVE-2025-40162), [CVE-2025-40133](https://nvd.nist.gov/vuln/detail/CVE-2025-40133), [CVE-2025-40095](https://nvd.nist.gov/vuln/detail/CVE-2025-40095), [CVE-2025-40094](https://nvd.nist.gov/vuln/detail/CVE-2025-40094), [CVE-2025-40093](https://nvd.nist.gov/vuln/detail/CVE-2025-40093), [CVE-2025-40092](https://nvd.nist.gov/vuln/detail/CVE-2025-40092), [CVE-2025-40090](https://nvd.nist.gov/vuln/detail/CVE-2025-40090), [CVE-2025-40088](https://nvd.nist.gov/vuln/detail/CVE-2025-40088), [CVE-2025-40105](https://nvd.nist.gov/vuln/detail/CVE-2025-40105), [CVE-2025-40104](https://nvd.nist.gov/vuln/detail/CVE-2025-40104), [CVE-2025-40103](https://nvd.nist.gov/vuln/detail/CVE-2025-40103), [CVE-2025-40101](https://nvd.nist.gov/vuln/detail/CVE-2025-40101), [CVE-2025-40100](https://nvd.nist.gov/vuln/detail/CVE-2025-40100), [CVE-2025-40099](https://nvd.nist.gov/vuln/detail/CVE-2025-40099), [CVE-2025-40096](https://nvd.nist.gov/vuln/detail/CVE-2025-40096), [CVE-2025-40087](https://nvd.nist.gov/vuln/detail/CVE-2025-40087), [CVE-2025-40085](https://nvd.nist.gov/vuln/detail/CVE-2025-40085), [CVE-2025-40040](https://nvd.nist.gov/vuln/detail/CVE-2025-40040), [CVE-2025-40106](https://nvd.nist.gov/vuln/detail/CVE-2025-40106), [CVE-2025-40084](https://nvd.nist.gov/vuln/detail/CVE-2025-40084), [CVE-2025-40211](https://nvd.nist.gov/vuln/detail/CVE-2025-40211), [CVE-2025-40209](https://nvd.nist.gov/vuln/detail/CVE-2025-40209)) #### Bug fixes: - Fixed the loading of kernel modules from system extensions via udev (e.g. at boot time).([flatcar/scripts#3367](https://github.com/flatcar/scripts/pull/3367)) #### Changes: - Added Nutanix images ([flatcar/scripts#3311](https://github.com/flatcar/scripts/pull/3311)) #### Updates: - Linux ([6.12.58](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.58) (includes [6.12.57](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.57), [6.12.56](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.56), [6.12.55](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.55))) #### New Stable Release 4459.2.1 _Changes since **Stable 4459.2.0**_ #### Security fixes: - Linux ([CVE-2025-40177](https://nvd.nist.gov/vuln/detail/CVE-2025-40177), [CVE-2025-40176](https://nvd.nist.gov/vuln/detail/CVE-2025-40176), [CVE-2025-40172](https://nvd.nist.gov/vuln/detail/CVE-2025-40172), [CVE-2025-40173](https://nvd.nist.gov/vuln/detail/CVE-2025-40173), [CVE-2025-40166](https://nvd.nist.gov/vuln/detail/CVE-2025-40166), [CVE-2025-40167](https://nvd.nist.gov/vuln/detail/CVE-2025-40167), [CVE-2025-40165](https://nvd.nist.gov/vuln/detail/CVE-2025-40165), [CVE-2025-40162](https://nvd.nist.gov/vuln/detail/CVE-2025-40162), [CVE-2025-40133](https://nvd.nist.gov/vuln/detail/CVE-2025-40133), [CVE-2025-40095](https://nvd.nist.gov/vuln/detail/CVE-2025-40095), [CVE-2025-40094](https://nvd.nist.gov/vuln/detail/CVE-2025-40094), [CVE-2025-40093](https://nvd.nist.gov/vuln/detail/CVE-2025-40093), [CVE-2025-40092](https://nvd.nist.gov/vuln/detail/CVE-2025-40092), [CVE-2025-40090](https://nvd.nist.gov/vuln/detail/CVE-2025-40090), [CVE-2025-40088](https://nvd.nist.gov/vuln/detail/CVE-2025-40088), [CVE-2025-40105](https://nvd.nist.gov/vuln/detail/CVE-2025-40105), [CVE-2025-40104](https://nvd.nist.gov/vuln/detail/CVE-2025-40104), [CVE-2025-40103](https://nvd.nist.gov/vuln/detail/CVE-2025-40103), [CVE-2025-40101](https://nvd.nist.gov/vuln/detail/CVE-2025-40101), [CVE-2025-40100](https://nvd.nist.gov/vuln/detail/CVE-2025-40100), [CVE-2025-40099](https://nvd.nist.gov/vuln/detail/CVE-2025-40099), [CVE-2025-40096](https://nvd.nist.gov/vuln/detail/CVE-2025-40096), [CVE-2025-40087](https://nvd.nist.gov/vuln/detail/CVE-2025-40087), [CVE-2025-40085](https://nvd.nist.gov/vuln/detail/CVE-2025-40085), [CVE-2025-40040](https://nvd.nist.gov/vuln/detail/CVE-2025-40040), [CVE-2025-40106](https://nvd.nist.gov/vuln/detail/CVE-2025-40106), [CVE-2025-40084](https://nvd.nist.gov/vuln/detail/CVE-2025-40084), [CVE-2025-40211](https://nvd.nist.gov/vuln/detail/CVE-2025-40211), [CVE-2025-40209](https://nvd.nist.gov/vuln/detail/CVE-2025-40209)) #### Bug fixes: - Fixed the loading of kernel modules from system extensions via udev (e.g. at boot time). ([flatcar/scripts#3367](https://github.com/flatcar/scripts/pull/3367)) #### Changes: - Added Nutanix images ([flatcar/scripts#3311](https://github.com/flatcar/scripts/pull/3311)) #### Updates: - Linux ([6.12.58](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.58) (includes [6.12.57](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.57), [6.12.56](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.56), [6.12.55](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tag/?h=v6.12.55))) Best, The Flatcar Container Linux Maintainers --- ### Communication #### Go/No-Go message for Matrix/Slack Go/No-Go Meeting for Alpha 4515.0.1, Beta 4459.1.2, Stable 4459.2.1 Pre-view images are available in https://bincache.flatcar-linux.net/images/amd64/$VERSION/ Tracking issue: https://github.com/flatcar/Flatcar/issues/1949 The Go/No-Go document is in our HackMD @flatcar namespace Link: https://hackmd.io/@flatcar/S1wn-T6gbg Please give your Go/No-Go vote with 💚 for Go, ❌ for No-Go, and ✋ for Wait. Contributors & community feel free to put your suggestions, thoughts or comments on the document or here in the chat. @yudocaa.3p:matrix.org @jerseychewi:matrix.org @tormath1:matrix.org @ader1990:matrix.org @thilofm:matrix.org @pothos:matrix.org @dongsupark:matrix.org @krnowak:matrix.org @gabriel-samfira:matrix.org @jan_bronicki:matrix.org @ervin.racz:matrix.org @dzatovic:matrix.org @jepio:matrix.org #### Mastodon _The toot (from [@flatcar](https://hachyderm.io/@flatcar)) goes out after the changelog update has been published; it includes a link to the web changelog._ 📢 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. --- 🛡️ 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: https://www.flatcar.org/releases/ #### Kubernetes Slack _This goes in the #flatcar channel_ Please welcome Flatcar releases of this month: - Alpha 4515.0.1 (maintenance release) - Beta 4459.1.2 (maintenance release) - Stable 4459.2.1 (maintenance release) 📢 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 sysext module loading, and restored SSSD components in Alpha. Nutanix support is now available on all channels. 🛡️ Stable: Linux 6.12.58 + udev module-loading fix ⚙️ Beta: Same kernel and fixes as Stable 🚀 Alpha: Restored LDB modules (fixes SSSD) + improved sysext module loading 📜 Full release notes: https://www.flatcar.org/releases/