Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Oracle | Vm Server | 3.3 |
| Xen | Xen | >= 4.3.0, <= 4.3.4 |
| Fedoraproject | Fedora | 22 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlMailing ListThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlMailing ListThird Party Advisory
- http://support.citrix.com/article/CTX209443Third Party Advisory
- http://www.debian.org/security/2016/dsa-3554Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmThird Party Advisory
- http://www.securityfocus.com/bid/85716Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1035435Third Party AdvisoryVDB Entry
- http://xenbits.xen.org/xsa/advisory-172.htmlPatchVendor Advisory
- http://xenbits.xen.org/xsa/xsa172.patchPatchVendor Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlMailing ListThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlMailing ListThird Party Advisory
- http://support.citrix.com/article/CTX209443Third Party Advisory
- http://www.debian.org/security/2016/dsa-3554Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmThird Party Advisory
- http://www.securityfocus.com/bid/85716Third Party AdvisoryVDB Entry
FAQ
What is CVE-2016-3159?
CVE-2016-3159 is a vulnerability with a CVSS score of 3.8 (LOW). 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 sensitiv...
How severe is CVE-2016-3159?
CVE-2016-3159 has been rated LOW with a CVSS base score of 3.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-3159?
Check the references section above for vendor advisories and patch information. Affected products include: Oracle Vm Server, Xen Xen, Fedoraproject Fedora, Debian Debian Linux.