CVE-2016-9386

Name: CVE-2016-9386
Creator: NVD / NIST
Published: 2017-01-23T21:59:02.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.45%

Last modified Jun 17, 2026

CVE-2016-9386 is a vulnerability of currently unknown severity. The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Metrics

EPSS Probability

0.45%

35.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-264

Affected Software

Vendor	Product	Versions
Citrix	Xenserver	6.0.2
Citrix	Xenserver	6.2.0
Citrix	Xenserver	6.5
Citrix	Xenserver	7.0
Xen	Xen	All versions

References

http://www.securityfocus.com/bid/94471Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037340Third Party Advisory, VDB Entry
http://xenbits.xen.org/xsa/advisory-191.htmlPatch, Vendor Advisory
https://security.gentoo.org/glsa/201612-56
https://support.citrix.com/article/CTX218775Patch, Third Party Advisory
http://www.securityfocus.com/bid/94471Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037340Third Party Advisory, VDB Entry
http://xenbits.xen.org/xsa/advisory-191.htmlPatch, Vendor Advisory
https://security.gentoo.org/glsa/201612-56
https://support.citrix.com/article/CTX218775Patch, Third Party Advisory

Timeline

Published: Jan 23, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-9386?

How severe is CVE-2016-9386?

Severity scoring for CVE-2016-9386 is pending analysis. The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2016-9386?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-9386?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST