@Arwalk this cover tech detail of meltdown, haven't finished reading, not sure it discuss spectre in detail
https://meltdownattack.com/meltdown.pdf
this one is easy reading
https://arstechnica.com/gadgets/2018/01/meltdown-and-spectre-every-modern-processor-has-unfixable-security-flaws/
Wikipedia
• https://en.wikipedia.org/wiki/Meltdown_(security_vulnerability)
• https://en.wikipedia.org/wiki/Spectre_(security_vulnerability)