Several vulnerabilities have been discovered in kvm, a full virtualization system. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2008-5714 Chris Webb discovered an off-by-one bug limiting KVM"s VNC passwords to 7 characters. This flaw might make it easier for remote attackers to guess the VNC password, which is limited to seven characters where eight was intended. CVE-2009-3290 It was discovered that the kvm_emulate_hypercall function in KVM does not prevent access to MMU hypercalls from ring 0, which allows local guest OS users to cause a denial of service and read or write guest kernel memory. For the stable distribution , these problems have been fixed in version 72+dfsg-5~lenny3. The oldstable distribution does not contain kvm. For the testing distribution these problems will be fixed soon. For the unstable distribution these problems have been fixed in version 85+dfsg-4.1 We recommend that you upgrade your kvm packages.