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Old 20th June 2018
comet--berkeley comet--berkeley is offline
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Default OpenBSD disables Intel’s hyper-threading

OpenBSD has disabled Intel’s hyper-threading technology, citing security concerns.

As detailed in this post, OpenBSD maintainer Mark Kettenis wrote that “SMT (Simultanious Multi Threading) implementations typically share TLBs and L1 caches between threads.”

--The Register, 20 June 2018

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Old 22nd June 2018
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Judging by the follow-up emails it's not a theoretical problem:

Jasper Lievisse Adriaanse <jas...@openbsd.org> wrote:

> Thanks to Ben Gras of VUSec for sharing an early version the research paper
> with us. More details will be made public soon as 'tlbleed'.

Thanks for saying that Jasper. And thanks to Ben for getting the
paper to us.

As demonstrated in the commit message, we hesitate to pass on more
information. That remains Ben's thunder in Vegas.

However we wanted to get a usable mitigation for the problem into
public. Maybe Intel has solutions with less overhead. But Intel
excluded us from conversation so we don't know what those solutions
might be. So we follow a pattern of immediately releasing a rough
solution, which we can retract if a cheaper solution becomes published.
UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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Old 2nd November 2018
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Say hello to PortSmash (CVE-2018-5407), the new side-channel attack on HTT:
Vulnerability confirmed on Skylake and Kaby Lake CPU series. Researchers suspect AMD processors are also impacted.
OpenBSD gets mentioned, too:
Following the discovery of TLBleed, the OpenBSD project decided to disable support for Intel's HT technology in upcoming versions of the OpenBSD operating system, on the grounds of security.
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Old 16th November 2018
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It's interesting to mention what Colin Percival pointed out on the topic back in 2005 already: Hyper-Threading Considered Harmful
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