FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

qemu -- denial of service vulnerability in USB EHCI emulation support

Affected packages
0 <= qemu
0 <= qemu-devel
qemu-sbruno < 2.5.50.g20151224
qemu-user-static < 2.5.50.g20151224

Details

VuXML ID 60cb2055-b1b8-11e5-9728-002590263bf5
Discovery 2015-12-14
Entry 2016-01-03

Prasad J Pandit, Red Hat Product Security Team, reports:

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 isochronous transfer descriptor list(iTD) and an infinite loop unfolds if there is a closed loop in this list.

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

References

CVE Name CVE-2015-8558
FreeBSD PR ports/205814
URL http://git.qemu.org/?p=qemu.git;a=commit;h=156a2e4dbffa85997636a7a39ef12da6f1b40254
URL http://www.openwall.com/lists/oss-security/2015/12/14/9
URL https://github.com/seanbruno/qemu-bsd-user/commit/156a2e4dbffa85997636a7a39ef12da6f1b40254