Last week (23w30) I stumbled upon such a ‘great’ vulnerability, but also the great explanation (and I’ve read a ‘few’).
Explanation of Zenbleed is here https://lock.cmpxchg8b.com/zenbleed.html.
And I highly recommend it to anyone interested in learning some of the ‘magic’ of modern CPUs on a ever-expanding 40+ year old x86 instruction set.
And a bit of jealous how clean and clear the walk-through is written 🙂