Linux kernel 4.15 has been in development since the end of November 2017, and it’s now time the development cycle to come to an end, and today’s Release Candidate brings even more of the x86 page table isolation (PTI) patches to mitigate those nasty Meltdown and Spectre security vulnerabilities that put billions of devices at risk of attacks. Besides the x86 PTI patches to mitigate the Meltdown and Spectre hardware bugs affecting all devices running processors made in the past 25 years, the seventh Release Candidate of the Linux 4.15 kernel series includes various updated GPU, crypto, input layer, and platform drivers, as well as some small improvements for various filesystems and architectures.