CVE-2016-9381

Name	CVE-2016-9381
Description	Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-720-1
NVD severity	medium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xen (PTS)	wheezy	4.1.4-3+deb7u9	vulnerable
	wheezy (security)	4.1.6.lts1-13	fixed
	jessie (security), jessie	4.4.1-9+deb8u10	fixed
	buster, sid, stretch (security), stretch	4.8.3+comet2+shim4.10.0+comet3-1+deb9u5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
xen	source	(unstable)	4.4.0-1	medium
xen	source	wheezy	4.1.6.lts1-4	medium	DLA-720-1

Xen switched to qemu-system in 4.4.0-1
https://xenbits.xen.org/xsa/advisory-197.html