Xen through 4.8.x mishandles the "contains segment descriptors" property during GNTTABOP_transfer (aka guest transfer) operations, which might allow PV guest OS users to execute arbitrary code on the host OS, aka XSA-214.
https://xenbits.xen.org/xsa/advisory-214.html
https://security.gentoo.org/glsa/201705-11
https://blog.xenproject.org/2017/05/02/updates-on-xsa-213-xsa-214-and-xsa-215/