# Hyperthreading contains security risk

**URL:** <https://forum.kirupa.com/t/hyperthreading-contains-security-risk/90277>\
**Category:** random\
**Created:** [May 16, 2005, 4:39pm UTC](https://forum.kirupa.com/t/hyperthreading-contains-security-risk/90277 "2005-05-16T16:39:28Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Maizoon](https://avatars.discourse-cdn.com/v4/letter/m/3d9bf3/32.png) [@Maizoon](https://forum.kirupa.com/u/Maizoon)\
**Post date:** [May 16, 2005, 4:39pm UTC](https://forum.kirupa.com/t/hyperthreading-contains-security-risk/90277/1 "2005-05-16T16:39:28Z")

</div>

> Hyper-Threading, as currently implemented on Intel Pentium Extreme Edition, Pentium 4, Mobile Pentium 4, and Xeon processors, suffers from a serious security flaw. This flaw permits local information disclosure, including allowing an unprivileged user to steal an RSA private key being used on the same machine. Administrators of multi-user systems are strongly advised to take action to disable Hyper-Threading immediately; single-user systems (i.e., desktop computers) are not affected.

[http://www.daemonology.net/hyperthreading-considered-harmful/](http://www.daemonology.net/hyperthreading-considered-harmful/)

Wonder if AMD’s parallel technology, HyperTransport suffers from the same risk?