Linus Torvalds released the fourth release candidate (RC4) for Linux Kernel version 6.19 on 4 January 2026. This update marks the first major step back toward a normal development rhythm after the quiet holiday season. Although the update remains "a bit smaller than usual," it is gaining momentum as developers return to their desks.
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Getting Back to Normal
The timing of the holidays often slows down the pace of kernel development. In the Linux 6.19-rc4 announcement mail, Linus Torvalds noted that while rc4 is still small, it is not "much smaller" than a typical release.
Because the team lost some time during the end-of-year break, Torvalds plans to release an rc8 for the Linux 6.19 version. This extra week will provide enough time to ensure the kernel is stable and ready for a final release, even though no major issues currently exist.
A Focus on Stability and Drivers
The changes in Linux 6.19-rc4 consist mainly of "random driver fixes" and general system refinements. If you look at the shortlog, you will see improvements in several key areas:
- Drivers: The bulk of the work involves fixes for network, GPU, and RDMA (Remote Direct Memory Access) drivers. Specifically, updates arrived for AMD and Intel hardware, as well as various wireless components.
- Architecture Updates: LoongArch received a significant amount of "noise" this week, including definitions for CPUCFG registers and BPF improvements.
- Tooling: Developers updated selftests, synchronized headers for the perf tool, and reverted a recent change to clang-tools.
- Core Systems: There are several small fixes for core networking, io_uring, and memory management (MM). For instance, the MM team fixed issues related to page allocation and swap cache folios.
Notable Fixes and Filesystems
Even though the release is small, it addresses various "one- and few-liners" across the kernel.
- Filesystems: The nfsd and smb subsystems saw several refinements, including fixes for memory leaks and reference count issues.
- Security and Memory: The update includes fixes for KASAN (Kernel Address Sanitizer) and refinements for the Maple Tree data structure.
- Hardware Support: New support arrived for various laptop features, such as display toggles for Asus notebooks and better WMI support for ThinkCenter devices.
Download and Test Linux Kernel 6.19 RC4
The release of rc4 shows that the Linux community is successfully shaking off the holiday "sluggishness" mentioned in the previous week's update. By adding an rc8 to the schedule, Linus Torvalds is prioritizing quality over speed. This decision ensures that every driver fix and architecture update receives thorough testing before the final version reaches users.
As always, Torvalds encourages everyone to "keep testing and reporting any issues" they find to help make Linux 6.19 the best it can be.
Users and enthusiasts can download the Kernel 6.19 RC4 from the Kernel.org website and/or the Linus Torvalds's git tree.
Linux Kernel 6.19 Final Release Date
Since Linus confirmed that there will be an rc8, Feb 8, 2026 is the earliest likely final release date, if rc8 is the last release candidate.
- rc1: Dec 14, 2025
- rc2: Dec 21, 2025
- rc3: Dec 28, 2025
- rc4: Jan 04, 2026
- rc5: Jan 11, 2026
- rc6: Jan 18, 2026
- rc7: Jan 25, 2026
- rc8: Feb 01, 2026
- Final release: One week after rc8: Feb 8, 2026 (assuming rc8 is final RC)
Please note that this is my assumption. Linux 6.19 could release on Feb 8, 2026, but that date is not guaranteed, since the final release depends on stability after rc8.
If rc8 is not stable, the final release will be delayed by one week (or more):
- Final release moves to Feb 15, 2026
- Or later if more RCs are needed.
