qemu - security update

Multiple vulnerabilities have been found in QEMU:

• CVE-2016-8576
  Quick Emulator (Qemu) built with the USB xHCI controller emulation support
  is vulnerable to an infinite loop issue. It could occur while processing USB
  command ring in xhci_ring_fetch.
• CVE-2016-8577
  Quick Emulator (Qemu) built with the virtio-9p back-end support is
  vulnerable to a memory leakage issue. It could occur while doing a I/O read
  operation in v9fs_read() routine.
• CVE-2016-8578
  Quick Emulator (Qemu) built with the virtio-9p back-end support is
  vulnerable to a null pointer dereference issue. It could occur while doing
  an I/O vector unmarshalling operation in v9fs_iov_vunmarshal() routine.
• CVE-2016-8669
  Quick Emulator (Qemu) built with the 16550A UART emulation support is
  vulnerable to a divide by zero issue. It could occur while updating serial
  device parameters in serial_update_parameters.

For Debian 7 Wheezy, these problems have been fixed in version
1.1.2+dfsg-6+deb7u17.

We recommend that you upgrade your qemu packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;