Package : xen Version : 4.1.6.lts1-2 CVE ID : CVE-2016-7092 CVE-2016-7094
Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:
Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba discovered a flaw in the handling of L3 pagetable entries, allowing a malicious 32-bit PV guest administrator can escalate their privilege to that of the host.
x86 HVM guests running with shadow paging use a subset of the x86 emulator to handle the guest writing to its own pagetables. Andrew Cooper of Citrix discovered that there are situations a guest can provoke which result in exceeding the space allocated for internal state. A malicious HVM guest administrator can cause Xen to fail a bug check, causing a denial of service to the host.
For Debian 7 "Wheezy", these problems have been fixed in version 4.1.6.lts1-2. For Debian 8 "Jessie", these problems have been fixed in version 4.4.1-9+deb8u7.
We recommend that you upgrade your xen packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS