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FreeBSD: VID-523BB0B7-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-9382): xen-kernel -- x86 task switch to VM86 mode mis-handled

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FreeBSD: VID-523BB0B7-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-9382): xen-kernel -- x86 task switch to VM86 mode mis-handled

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
11/22/2016
Created
07/25/2018
Added
12/04/2016
Modified
05/07/2019

Description

Xen 4.0.x through 4.7.x mishandle x86 task switches to VM86 mode, which allows local 32-bit x86 HVM guest OS users to gain privileges or cause a denial of service (guest OS crash) by leveraging a guest operating system that uses hardware task switching and allows a new task to start in VM86 mode.

Solution(s)

  • freebsd-upgrade-package-xen-kernel

References

  • CVE-2016-9382
  • DLA-720-1
  • DSA-3729

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