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TI-2016-02649 Aliases CVE-2016-3159GHSA-h55q-7cr6-wwr6

The fpu_fxrstor function in arch/x86/i387.c in Xen 4.x does not properly handle writes to…

Priority LOW 18CWE-200Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure, Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-200 and CWE-284.

Summary

The fpu_fxrstor function in arch/x86/i387.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.

Why it matters now

EPSS 0.00399 34th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:oracle:vm_server:3.3:*:*:*:*:*:*:*3.3VulnerableOracle
cpe:2.3:o:oracle:vm_server:3.4:*:*:*:*:*:*:*3.4VulnerableOracle
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*4.3.0 – 4.3.4; 4.4.0 – 4.4.4; 4.5.0 – 4.5.3; 4.6.0 – 4.6.1VulnerableXen
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*22VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*23VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
  • cpe:2.3:o:oracle:vm_server:3.3:*:*:*:*:*:*:* Versions 3.3 Vulnerable ·Oracle
  • cpe:2.3:o:oracle:vm_server:3.4:*:*:*:*:*:*:* Versions 3.4 Vulnerable ·Oracle
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* Versions 4.3.0 – 4.3.4; 4.4.0 – 4.4.4; 4.5.0 – 4.5.3; 4.6.0 – 4.6.1 Vulnerable ·Xen
  • cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* Versions 22 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:* Versions 23 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-3159
  2. 2026-10-03 Alias added: GHSA-h55q-7cr6-wwr6

References

Patch 2

Advisory 5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences