CVE-2016-7777

LOW

Description

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

References

http://www.securityfocus.com/bid/93344

http://www.securitytracker.com/id/1036942

http://xenbits.xen.org/xsa/advisory-190.html

https://security.gentoo.org/glsa/201611-09

https://support.citrix.com/article/CTX217363

Details

Source: MITRE

Published: 2016-10-07

Updated: 2017-07-01

Type: CWE-362

Risk Information

CVSS v2.0

Base Score: 3.3

Vector: AV:L/AC:M/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 3.4

Severity: LOW

CVSS v3.0

Base Score: 6.3

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Impact Score: 5.2

Exploitability Score: 1

Severity: MEDIUM