Vulnerability Monitor

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CVE-2016-3158

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.

Security Impact Summary

This vulnerability carries a LOW severity rating with a CVSS v3.1 score of 3.8, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts limited data confidentiality, for affected systems. Impacting 3 products from xen, from fedoraproject, from oracle organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-04-13T16:59:18.350

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 3.8 (LOW)

CVSSv2 Vector

AV:L/AC:L/Au:S/C:P/I:N/A:N

Access Vector: LOCAL
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

3.1

Impact Score

2.9

Weaknesses

Type: Primary
CWE-200
CWE-284

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	xen	xen	≤ 4.4.0	Yes
Operating System	fedoraproject	fedora	22	Yes
Operating System	fedoraproject	fedora	23	Yes
Operating System	oracle	vm_server	3.3	Yes
Operating System	oracle	vm_server	3.4	Yes

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html Third Party Advisory ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html Third Party Advisory ([email protected])
http://support.citrix.com/article/CTX209443 ([email protected])
http://www.debian.org/security/2016/dsa-3554 ([email protected])
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/85714 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1035435 Third Party Advisory, VDB Entry ([email protected])
http://xenbits.xen.org/xsa/advisory-172.html Vendor Advisory ([email protected])
http://xenbits.xen.org/xsa/xsa172-4.3.patch Patch ([email protected])
http://xenbits.xen.org/xsa/xsa172.patch Patch ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://support.citrix.com/article/CTX209443 (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2016/dsa-3554 (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/85714 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1035435 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://xenbits.xen.org/xsa/advisory-172.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://xenbits.xen.org/xsa/xsa172-4.3.patch Patch (af854a3a-2127-422b-91ae-364da2661108)
http://xenbits.xen.org/xsa/xsa172.patch Patch (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For xen's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.