The VGA module in QEMU improperly performs bounds checking on banked access to video memory, which allows local guest OS administrators to execute arbitrary code on the host by changing access modes after setting the bank register, aka the "Dark Portal" issue.
http://www.openwall.com/lists/oss-security/2016/05/09/3
https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg01197.html
http://xenbits.xen.org/xsa/advisory-179.html
http://www.securitytracker.com/id/1035794
http://www.debian.org/security/2016/dsa-3573
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05164862
http://www.ubuntu.com/usn/USN-2974-1
http://rhn.redhat.com/errata/RHSA-2016-1019.html
https://access.redhat.com/errata/RHSA-2016:1224
http://rhn.redhat.com/errata/RHSA-2016-1002.html
http://rhn.redhat.com/errata/RHSA-2016-1001.html
http://rhn.redhat.com/errata/RHSA-2016-0725.html
http://rhn.redhat.com/errata/RHSA-2016-0999.html
http://rhn.redhat.com/errata/RHSA-2016-1000.html
http://rhn.redhat.com/errata/RHSA-2016-0724.html
http://rhn.redhat.com/errata/RHSA-2016-0997.html
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
http://www.securityfocus.com/bid/90316
Source: MITRE
Published: 2016-05-11
Updated: 2021-08-04
Type: CWE-119
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 8.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 2
Severity: HIGH