Third party firmwares patch this. However it's the carriers and manufacturers who lock down bootloaders, void warranties, and refuse to allow a more open environment that refuse to make additional changes or updates. I've got a Note 2, it was updated by Samsung nearly a month before Verizon could come out with the update and that was delayed quite a bit from when Google released 4.4.2.
You can blame Google all you want, but it's an Open Source OS and patches can be backported by anyone. Sadly the only people interested in doing that have no power over the carriers and device manufacturers.