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FreeBSD: VID-4D7CF654-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-7777): xen-kernel -- CR0.TS and CR0.EM not always honored for x86 HVM guests

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FreeBSD: VID-4D7CF654-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-7777): xen-kernel -- CR0.TS and CR0.EM not always honored for x86 HVM guests

Severity
3
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:N)
Published
10/04/2016
Created
07/25/2018
Added
12/04/2016
Modified
05/07/2019

Description

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

Solution(s)

  • freebsd-upgrade-package-xen-kernel

References

  • CVE-2016-7777
  • DLA-699-1
  • DSA-3729

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