CVE-2016-3158

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.

Category

3.8
CVSS
Severity: Low
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.05%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory oracle.com Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html third party advisory vendor advisory
http://www.securityfocus.com/bid/85714 vdb entry third party advisory
http://xenbits.xen.org/xsa/xsa172-4.3.patch patch
http://xenbits.xen.org/xsa/advisory-172.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html third party advisory vendor advisory
http://xenbits.xen.org/xsa/xsa172.patch patch
http://www.securitytracker.com/id/1035435 vdb entry third party advisory
http://support.citrix.com/article/CTX209443
http://www.debian.org/security/2016/dsa-3554 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-3158?
CVE-2016-3158 has been scored as a low severity vulnerability.
How to fix CVE-2016-3158?
To fix CVE-2016-3158, 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-2016-3158 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-3158 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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