HIGH
The smartcard interaction in SPICE allows remote attackers to cause a denial of service (QEMU-KVM process crash) or possibly execute arbitrary code via vectors related to connecting to a guest VM, which triggers a heap-based buffer overflow.
http://lists.opensuse.org/opensuse-updates/2016-07/msg00003.html
http://lists.opensuse.org/opensuse-updates/2016-07/msg00004.html
http://www.debian.org/security/2016/dsa-3596
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.ubuntu.com/usn/USN-3014-1
https://access.redhat.com/errata/RHSA-2016:1204
Source: MITRE
Published: 2016-06-09
Updated: 2019-04-22
Type: CWE-119
Base Score: 10
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL