CVE-2018-7540

Name	CVE-2018-7540
Description	An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.
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-1300-1, DSA-4131-1
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)	jessie (security), jessie	4.4.1-9+deb8u10	vulnerable
	stretch (security)	4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10	fixed
	buster, stretch, sid	4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
xen	source	(unstable)	4.8.3+comet2+shim4.10.0+comet3-1+deb9u5	medium
xen	source	stretch	4.8.3+comet2+shim4.10.0+comet3-1+deb9u5	medium	DSA-4131-1
xen	source	wheezy	4.1.6.lts1-13	medium	DLA-1300-1

https://xenbits.xen.org/xsa/advisory-252.html