CVE-2017-6058 Qemu: net: vmxnet3: OOB NetRxPkt::ehdr_buf access when doing vlan stripping

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

  Hello,

Quick Emulator(Qemu) built with the VMWARE VMXNET3 NIC device support is 
vulnerable to an out-of-bounds access issue. It could occur while stripping 
VLAN header from 'eth_buf' buffer in receiving packets.

A remote user/process could use this issue to crash Qemu process resulting in 
DoS.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2017-02/msg03527.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1423358

Note:- It requires 'VLANSTRIP' feature to be enabled on the vmxnet3 device.


'CVE-2017-6058' assigned via -> https://cveform.mitre.org/


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