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This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A privileged attacker, inside a guest system, can create a memory
leak via the emulated xHCI controller in QEMU, in order to trigger
a denial of service on the host system.

Impacted products: QEMU.

Severity: 1/4.

Creation date: 20/09/2016.

DESCRIPTION OF THE VULNERABILITY

The QEMU product can emulate USB devices using a xHCI bus
controller.

However, the handling of device unplug does not free all the
memory that was allocated at device insertion .

A privileged attacker, inside a guest system, can therefore create
a memory leak via the emulated xHCI controller in QEMU, in order
to trigger a denial of service on the host system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/QEMU-memory-leak-via-xHCI-20652