CVE-2016-3158

Name: CVE-2016-3158
Creator: NVD / NIST
Published: 2016-04-13T16:59:18.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.41%

Last modified Jun 17, 2026

CVE-2016-3158 is a vulnerability of currently unknown severity. The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

Description

The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.

Metrics

EPSS Probability

0.41%

32.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xen	Xen	<= 4.4.0
Fedoraproject	Fedora	22
Fedoraproject	Fedora	23
Oracle	Vm Server	3.3
Oracle	Vm Server	3.4

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlThird Party Advisory
http://support.citrix.com/article/CTX209443
http://www.debian.org/security/2016/dsa-3554
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlVendor Advisory
http://www.securityfocus.com/bid/85714Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035435Third Party Advisory, VDB Entry
http://xenbits.xen.org/xsa/advisory-172.htmlVendor Advisory
http://xenbits.xen.org/xsa/xsa172-4.3.patchPatch
http://xenbits.xen.org/xsa/xsa172.patchPatch
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlThird Party Advisory
http://support.citrix.com/article/CTX209443
http://www.debian.org/security/2016/dsa-3554
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlVendor Advisory
http://www.securityfocus.com/bid/85714Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035435Third Party Advisory, VDB Entry
http://xenbits.xen.org/xsa/advisory-172.htmlVendor Advisory
http://xenbits.xen.org/xsa/xsa172-4.3.patchPatch
http://xenbits.xen.org/xsa/xsa172.patchPatch

Timeline

Published: Apr 13, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-3158?

How severe is CVE-2016-3158?

Severity scoring for CVE-2016-3158 is pending analysis. The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2016-3158?

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-2016-3158?

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

Scan your code now

Source: NVD / NIST