Access Restriction Bypass Affecting xen package, versions <4.7.1-r1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.06% (29th percentile)

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  • Snyk IDSNYK-ALPINE316-XEN-2845040
  • published21 Jul 2020
  • disclosed23 Jan 2017

Introduced: 23 Jan 2017

CVE-2016-9382  (opens in a new tab)
CWE-264  (opens in a new tab)

How to fix?

Upgrade Alpine:3.16 xen to version 4.7.1-r1 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 Alpine. See How to fix? for Alpine:3.16 relevant fixed versions and status.

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.