CVE-2016-7777

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.

Category

6.3
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.03%
Vendor Advisory gentoo.org Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://support.citrix.com/article/CTX217363
http://xenbits.xen.org/xsa/advisory-190.html patch vendor advisory mitigation
http://www.securityfocus.com/bid/93344 vdb entry third party advisory
https://security.gentoo.org/glsa/201611-09 vendor advisory
http://www.securitytracker.com/id/1036942 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2016-7777?
CVE-2016-7777 has been scored as a medium severity vulnerability.
How to fix CVE-2016-7777?
To fix CVE-2016-7777, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-7777 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-7777 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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