s->rx_level is read from the wire and used to determine how many bytes
to subsequently read into s->rx_fifo. If s->rx_level exceeds the
length of s->rx_fifo the buffer can be overrun with arbitrary data
from the wire.
An user able to alter the savevm data (either on the disk or over the wire
during migration) could use this flaw to to corrupt QEMU process memory on
the (destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.
This issue does not affect the versions of kvm package as shipped with
Red Hat Enterprise Linux 5.
This issue does not affect the versions of qemu-kvm package as shipped
with Red Hat Enterprise Linux 6
Created qemu tracking bugs for this issue:
Affects: fedora-all [bug 1095767]
qemu-1.6.2-5.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.