CVE-2019-3900 Kernel: vhost_net: infinite loop while receiving packets leads to DoS

[P J P <ppandit () redhat com>]

  Hello,

An infinite loop issue was found in the vhost_net kernel module, while 
handling incoming packets in handle_rx(). It could occur if one end sends 
packets faster than the other end can process them.

A guest user, maybe remote one, could use this flaw to stall the vhost_net 
kernel thread, resulting in a DoS scenario.

Upstream patch:
---------------
  -> https://www.spinics.net/lists/kernel/msg3111012.html

This issue was discovered by Jason Wang(CC'd) of Red Hat Inc.
'CVE-2019-3900' assigned by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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