When reading the Linux kernel system logs on an old computer, I saw a notice that computer’s particular CPU had the L1TF bug. What is this? It is another CPU hardware bug similar to Meltdown that allows reading privileged data via a side channel timing attack, due to the specifics of the L1 cache behavior.
20200121/https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html