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Since the AMD Inception vulnerability was made public in August there were kernel patches merged that day and since then there's been a few rounds of clean-ups and fixes for this mitigation code formally known as the Speculative Return Stack Overflow (SRSO)
Disclosed back in August was the Inception vulnerability affecting all Zen processors
It looks like the further-tuned AMD Inception / SRSO (Speculative Return Stack Overflow) mitigation code will be submitted for the upcoming Linux 6.6 merge window.
Last week the AMD Inception vulnerability was made public as a speculative side channel attack affecting Zen processors and different mitigation options based on the CPU generation.
As soon as the AMD Inception CPU vulnerability was made public yesterday, the Linux kernel mitigation patches were merged and within hours appeared in six new stable point releases for the kernel along with the Intel Downfall mitigation patches