The NetKVM Windows Virtio driver allows remote attackers to cause a denial of service (guest crash) via a crafted length value in an IP packet, as demonstrated by a value that does not account for the size of the IP options.
rhn.redhat.com/errata/RHSA-2015-1043.html
rhn.redhat.com/errata/RHSA-2015-1044.html
github.com/YanVugenfirer/kvm-guest-drivers-windows/commit/723416fa4210b7464b28eab89cc76252e6193ac1
github.com/YanVugenfirer/kvm-guest-drivers-windows/commit/fbfa4d1083ea84c5429992ca3e996d7d4fbc8238
www.redhat.com/security/data/cve/CVE-2015-3215.html