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.
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.24/SCOSA-2005.24.txt
marc.info/?l=freebsd-hackers&m=110994026421858&w=2
marc.info/?l=freebsd-security&m=110994370429609&w=2
marc.info/?l=openbsd-misc&m=110995101417256&w=2
secunia.com/advisories/15348
secunia.com/advisories/18165
securitytracker.com/id?1013967
sunsolve.sun.com/search/document.do?assetkey=1-26-101739-1
www-1.ibm.com/support/docview.wss?uid=isg1SSRVHMCHMC_C081516_754
www.daemonology.net/hyperthreading-considered-harmful/
www.daemonology.net/papers/htt.pdf
www.kb.cert.org/vuls/id/911878
www.redhat.com/support/errata/RHSA-2005-476.html
www.redhat.com/support/errata/RHSA-2005-800.html
www.securityfocus.com/bid/12724
www.vupen.com/english/advisories/2005/0540
www.vupen.com/english/advisories/2005/3002
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9747