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[Launchpad Bug Tracker <1718222@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qemu - 1:2.5+dfsg-5ubuntu10.16

---------------
qemu (1:2.5+dfsg-5ubuntu10.16) xenial-security; urgency=medium

  * SECURITY REGRESSION: regression in in USB xHCI emulation (LP: #1718222)
    - debian/patches/CVE-2017-9375-regression.patch: don't kick in
      xhci_submit and xhci_fire_ctl_transfer in hw/usb/hcd-xhci.c.

 -- Marc Deslauriers <marc.deslauriers@xxxxxxxxxx>  Wed, 20 Sep 2017
07:25:44 -0400

** Changed in: qemu (Ubuntu Xenial)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1718222

Title:
  CVE-2017-9375 fix cause qemu crash

Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Trusty:
  Fix Released
Status in qemu source package in Xenial:
  Fix Released
Status in qemu source package in Zesty:
  Fix Released
Status in qemu source package in Artful:
  Fix Released
Status in qemu package in Debian:
  Fix Released

Bug description:
  CVE-2017-9375 fix cause qemu crash on Ubuntu 17.04 if USB 3 controller
  is selected in virtual machine properties.

  To reproduce this issue:
  1. Install Ubuntu 17.04
  2. Install package ubuntu-virt
  3. Create virtual machine with USB 3 controller
  4. Try to start this virtual machine

  Error message from libvirt log:
  qemu-system-x86_64: /build/qemu-g5EXBU/qemu-2.8+dfsg/hw/usb/hcd-xhci.c:2169: xhci_kick_epctx: Assertion `!epctx->kick_active' failed.

  Workaround:
  Switch controller type to USB 2, but AFAIK this is not applicable if user need to passthrough many USB devices to guest, or if user actually need USB 3 speed.

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