vulnwire
3.8low

CVE-2016-3159

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 pro…

Published 10 y ago · modified 4 mo ago · JSON

CVSS
3.8
v3.0 · NVD
CISA KEV
No
not known exploited
EPSS
0.4%
percentile 34%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

0.40% probability of exploitation in the next 30 days, higher than 34% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.03.8CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD2.01.7AV:L/AC:L/Au:S/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-284 Improper Access Control

References

  • oracle.com /technetwork/topics/security/ovmbulletinjul2016-3090546.html · x_refsource_CONFIRM, x_transferred
  • lists.fedoraproject.org /pipermail/package-announce/2016-April/181699.html · vendor-advisory, x_refsource_FEDORA, x_transferred
  • xenbits.xen.org /xsa/advisory-172.html · x_refsource_CONFIRM, x_transferred
  • securityfocus.com /bid/85716 · vdb-entry, x_refsource_BID, x_transferred
  • lists.fedoraproject.org /pipermail/package-announce/2016-April/181729.html · vendor-advisory, x_refsource_FEDORA, x_transferred
  • xenbits.xen.org /xsa/xsa172.patch · x_refsource_CONFIRM, x_transferred
  • securitytracker.com /id/1035435 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • support.citrix.com /article/CTX209443 · x_refsource_CONFIRM, x_transferred
  • debian.org /security/2016/dsa-3554 · vendor-advisory, x_refsource_DEBIAN, x_transferred

Sources

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