Linux LTS Kernel Support Extended: New EOL Dates for 6.6, 6.12 & 6.18

Several Long Term Support (LTS) kernels for Linux will receive extended support timelines, according to a recent update from Greg Kroah-Hartman, a prominent Linux kernel developer. The adjusted end-of-life (EOL) dates, communicated via a commit to the kernel’s Git repository, reflect discussions with companies and groups relying on these stable kernel versions. This means organizations and users depending on these kernels can anticipate continued security and bug fixes for a longer period than initially projected.

Extended Support for Key LTS Releases

The updated schedule impacts three currently active LTS kernels: Linux 6.6, 6.12, and 6.18. Linux 6.6 will now be supported until December 2027, gaining an additional year of maintenance. Similarly, Linux 6.12’s support window has been extended to December 2028, also representing a two-year increase. Perhaps most notably, Linux 6.18, which was officially designated as an LTS kernel in December 2025, will now receive support through at least December 2028, exceeding its original projected EOL date of December 2027. It’s FOSS first reported on the changes.

These extensions are significant because LTS kernels are designed to provide stability and reliability for extended periods, making them popular choices for enterprise deployments and embedded systems where frequent updates are undesirable or impractical. The Linux kernel, at its core, is the foundation of the operating system, managing the system’s resources and enabling communication between hardware and software. An LTS kernel receives critical bug fixes and security patches for a defined period, ensuring a stable and secure environment.

What is an LTS Kernel and Why Does it Matter?

The Linux kernel follows a regular release cycle, with new major versions appearing several times a year. However, not all releases are designated as LTS. LTS kernels are chosen based on their stability and are maintained for a longer duration than standard releases. This extended support is crucial for organizations that require a predictable and reliable kernel version for their infrastructure. Switching to a new kernel version can be a complex and time-consuming process, requiring extensive testing and potential application compatibility adjustments.

Greg Kroah-Hartman, as the Linux stable kernel lead maintainer, plays a central role in this process. According to his Wikipedia entry, he is responsible for maintaining the -stable branch of the kernel, as well as several key subsystems including USB and the driver core. He works alongside Sasha Levin to oversee the maintenance of these LTS releases. The decision to extend support for these kernels wasn’t made in isolation, but rather through collaborative discussions with stakeholders who rely on these versions.

End of Life for Older Kernels

Although the extended support for newer LTS kernels is welcome news, the update also highlights the impending end-of-life for older versions. Linux 5.10 and 5.15 are both scheduled to reach their EOL in December of this year. This means that these kernels will no longer receive security updates or bug fixes, potentially exposing systems running them to vulnerabilities. Users and administrators still utilizing these older kernels are strongly advised to migrate to a supported version as soon as possible. The transition process can involve careful planning and testing to ensure compatibility with existing applications and hardware.

The Linux Kernel Development Cycle

Understanding how the Linux kernel is developed and maintained provides context for these support extensions. As detailed in a recent interview with Kroah-Hartman, the kernel development process is highly structured. A typical development cycle spans approximately nine weeks, culminating in a new kernel release. Throughout this cycle, developers submit patches – code changes – that are reviewed and tested by other developers. This rigorous review process helps to ensure the quality and stability of the kernel. The LTS kernels benefit from this ongoing development, with critical bug fixes and security patches backported from newer releases.

The trust model within the Linux kernel development community is also unique. Kroah-Hartman describes a system where developers earn trust through consistent contributions and adherence to established standards. This trust-based approach allows for a highly collaborative and efficient development process. The open-source nature of the kernel also allows anyone to contribute, fostering a vibrant and diverse community of developers.

Implications for Users and Industry

The extended support timelines primarily benefit organizations that prioritize stability and long-term maintainability. Industries such as telecommunications, finance, and healthcare often rely on LTS kernels to ensure the reliability of their critical infrastructure. The additional year of support provides these organizations with more time to plan and execute kernel upgrades without disrupting their operations.

For individual users, the impact is less direct but still relevant. Many Linux distributions, such as Debian and Ubuntu, base their releases on LTS kernels. The extended support for these kernels translates to longer support lifecycles for these distributions, providing users with a more stable and secure computing experience. However, it’s key to note that distribution support timelines may vary, so users should consult their distribution’s documentation for specific details.

What Comes Next: Maintaining Kernel Security

The extension of support for these LTS kernels is a procedural response to industry needs, driven by ongoing dialogue between maintainers and users. The next steps involve continued maintenance and backporting of security fixes to these supported kernels. Kernel developers will continue to monitor for vulnerabilities and release patches as needed. Users are encouraged to stay informed about security advisories and apply updates promptly. Regularly updating your system, even with an LTS kernel, is crucial for maintaining a secure computing environment. The ongoing commitment to maintaining these LTS kernels demonstrates the dedication of the Linux community to providing a stable and secure operating system for a wide range of users and applications.