oss-security - CVE request Qemu: usb: multiple eof_timers in ohci leads to null pointer dereference

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Date: Tue, 16 Feb 2016 17:06:13 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Zuozhi Fzz <zuozhi.fzz@...baba-inc.com>
Subject: CVE request Qemu: usb: multiple eof_timers in ohci leads to null
 pointer dereference

   Hello,

Qemu emulator built with the USB OHCI emulation support is vulnerable to a 
null pointer dereference issue. It could occur when OHCI transitions to a 
OHCI_USB_OPERATIONAL state, leading to creation of multiple eof timers. A 
privileged user inside guest could use this flaw to crash the Qemu process on 
the host, resulting in DoS.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg03374.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1304794

This issue was discovered by Zuozhi Fzz of Alibaba 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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