CVE-2015-4164

Name	CVE-2015-4164
Description	The compat_iret function in Xen 3.1 through 4.5 iterates the wrong way through a loop, which allows local 32-bit PV guest administrators to cause a denial of service (large loop and system hang) via a hypercall_iret call with EFLAGS.VM set.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-3286-1
Debian Bugs	795721

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xen (PTS)	bookworm, bookworm (security)	4.17.5+72-g01140da4e8-1	fixed
	trixie (security), trixie	4.20.3+127-gc42374a105-0+deb13u1	fixed
	forky, sid	4.20.3+127-gc42374a105-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
xen	source	squeeze	(unfixed)	end-of-life
xen	source	wheezy	4.1.4-3+deb7u8		DSA-3286-1
xen	source	jessie	4.4.1-9+deb8u1		DSA-3286-1
xen	source	(unstable)	4.6.0-1			795721

[squeeze] - xen <end-of-life> (Not supported in Squeeze LTS)
http://xenbits.xen.org/xsa/advisory-136.html