Date: Mon, 18 Apr 2016 17:44:21 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> cc: dushaobo@....cn Subject: Qemu: usb: Infinite loop vulnerability in usb_ehci using siTD process Hello, 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: --------------- -> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg02691.html Reference: ---------- -> https://bugzilla.redhat.com/show_bug.cgi?id=1325129 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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