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FreeBSD: VID-50AC2E96-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-9386): xen-kernel -- x86 null segments not always treated as unusable

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FreeBSD: VID-50AC2E96-BA4D-11E6-AE1B-002590263BF5 (CVE-2016-9386): xen-kernel -- x86 null segments not always treated as unusable

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
05/03/2019

Description

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Solution(s)

  • freebsd-upgrade-package-xen-kernel

References

  • 94471
  • 1037340
  • GLSA-201612-56
  • CVE-2016-9386
  • DLA-720-1
  • DSA-3729

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