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Date: Mon, 18 Apr 2016 17:44:21 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: Qemu: usb: Infinite loop vulnerability in usb_ehci using siTD


Qemu emulator built with the USB EHCI emulation support is vulnerable to an 
infinite loop issue. It occurs during communication between host controller 
interface(EHCI) and a respective device driver. These two communicate via a 
split isochronous transfer descriptor list(siTD) and an infinite loop unfolds 
if there is a closed loop in this list.

A privileges used inside guest could use this flaw to consume excessive CPU 
cycles & resources on the host.

This issue is similar to CVE-2015-8558, but using siTD instead of iTD.

Upstream patch:


This issue are discovered by Du Shaobo of Qihoo 360 Inc.

Thank you.
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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