Dang: "Hyper-Threading technology, as used in FreeBSD and other operating systems that are run on Intel Pentium and other processors, allows local users to use a malicious thread to create covert channels, monitor the execution of other threads, and obtain sensitive information such as cryptographic keys, via a timing attack on memory cache misses."
Also, found elsewhere:
"According to Linus Torvalds and others on linux-kernel this is a theoretical attack, paranoid people should disable hyper threading"
Re:MDS: Microarchitectural Data Sampling side-channel vulner...
by cperciva on Tuesday May 14, 2019 @11:34PM
(#19916192)
Yes. Intel dismissed it at the time, saying that "nobody would ever have untrusted code running on the same hardware on which cryptographic operations are performed".
Dang: "Hyper-Threading technology, as used in FreeBSD and other operating systems that are run on Intel Pentium and other processors, allows local users to use a malicious thread to create covert channels, monitor the execution of other threads, and obtain sensitive information such as cryptographic keys, via a timing attack on memory cache misses."
Also, found elsewhere:
"According to Linus Torvalds and others on linux-kernel this is a theoretical attack, paranoid people should disable hyper threading"