The kvm qemu vt100 emulation was affected by a problem where specific vt100 sequences could have been used by guest users to affect the host. (CVE-2012-3515 aka XSA-17).
Also a temp file race was fixed. (CVE-2012-2652)
Security Issue reference:
* CVE-2012-3515
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-3515>
* CVE-2012-2652
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2652>