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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-571-1 xen security update
Debian DSA Debian DSA DSA-3554-1 xen security update
EUVD EUVD EUVD-2016-4210 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 12 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00049}

epss

{'score': 0.00043}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-05T23:47:57.667Z

Reserved: 2016-03-15T00:00:00

Link: CVE-2016-3158

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2016-04-13T16:59:18.350

Modified: 2025-04-12T10:46:40.837

Link: CVE-2016-3158

cve-icon Redhat

Severity : Moderate

Publid Date: 2016-03-24T00:00:00Z

Links: CVE-2016-3158 - Bugzilla

cve-icon OpenCVE Enrichment

No data.