qemu -- denial of service vulnerability in e1000 NIC support

Prasad J Pandit, Red Hat Product Security Team, reports:

Qemu emulator built with the e1000 NIC emulation support is
vulnerable to an infinite loop issue. It could occur while
processing transmit descriptor data when sending a network packet.

A privileged user inside guest could use this flaw to crash the
Qemu instance resulting in DoS.