It's FOSS - https://itsfoss.com/linux-kernel-4-15-release-delayed/
Brief: Linux Kernel 4.15 release has been delayed because Intel has not yet provided a proper fix for the nasty CPU bugs. And that has made Linus Torvalds go into swearing mode, again.
Linux creator Linus Torvalds is furious. He is frustrated. He is using lots of cuss words as well.
The year 2018 started on a bad note as the computing world has been rocked by Meltdown and Spectre bugs. These kernel memory bugs open the possibilities of malicious scripts stealing secret data such as passwords. It’s not only Linux that has been impacted. Windows, macOS, BSD etc