CVE-2015-7970

Name	CVE-2015-7970
Description	The p2m_pod_emergency_sweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service (CPU consumption and possibly reboot) via crafted memory contents that triggers a "time-consuming linear scan," related to Populate-on-Demand.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DLA-479-1, DSA-3414-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xen (PTS)	buster, buster (security)	4.11.4+107-gef32c7afa2-1	fixed
	bullseye	4.14.5+86-g1c354767d5-1	fixed
	bullseye (security)	4.14.5+94-ge49571868d-1	fixed
	bookworm, sid	4.17.0+46-gaaf74a532c-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
xen	source	squeeze	(unfixed)	end-of-life
xen	source	wheezy	4.1.6.1-1+deb7u1		DLA-479-1
xen	source	jessie	4.4.1-9+deb8u3		DSA-3414-1
xen	source	(unstable)	4.6.0-1

Notes

[wheezy] - xen <no-dsa> (Minor issue, too intrusive to backport)
[squeeze] - xen <end-of-life> (not supported in squeeze-lts)
http://xenbits.xen.org/xsa/advisory-150.html