Race Condition Affecting xen package, versions <4.7.0-r5


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.06% (26th percentile)

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  • Snyk IDSNYK-ALPINE316-XEN-2845155
  • published21 Jul 2020
  • disclosed7 Oct 2016

Introduced: 7 Oct 2016

CVE-2016-7777  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Alpine:3.16 xen to version 4.7.0-r5 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 4.7.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.