QEMU 0.8.2 allows local users to halt a virtual machine by executing the icebp instruction.
osvdb.org/35496
secunia.com/advisories/25073
secunia.com/advisories/25095
secunia.com/advisories/29129
taviso.decsystem.org/virtsec.pdf
www.debian.org/security/2007/dsa-1284
www.mandriva.com/security/advisories?name=MDVSA-2008:162
www.securityfocus.com/bid/23731
www.vupen.com/english/advisories/2007/1597
exchange.xforce.ibmcloud.com/vulnerabilities/34043