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Information Exposure Affecting xen package, versions <4.8.0~rc3-1

Severity

 Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-DEBIAN12-XEN-1563889
  • published13 Apr 2016
  • disclosed13 Apr 2016
Report a new vulnerability Found a mistake?

Introduced: 13 Apr 2016

CVE-2016-3159  (opens in a new tab)
CWE-200  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

Upgrade Debian:12 xen to version 4.8.0~rc3-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.