CMPXCHG8B emulation in Xen 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a "supposedly-ignored" operand size prefix.
http://www.securitytracker.com/id/1037468
http://www.securityfocus.com/bid/94863
https://support.citrix.com/article/CTX219378
https://security.gentoo.org/glsa/201612-56
http://xenbits.xen.org/xsa/advisory-200.html
http://www.debian.org/security/2017/dsa-3847
Source: Mitre, NVD
Published: 2017-01-26
Updated: 2025-04-20
Base Score: 2.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N
Severity: Low
Base Score: 3.3
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS: 0.00069