Improper Privilege Management Affecting xen package, versions <4.15.0-r1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-ALPINE316-XEN-2845187
  • published10 Jun 2021
  • disclosed30 Jun 2021

Introduced: 10 Jun 2021

CVE-2021-28692  (opens in a new tab)
CWE-269  (opens in a new tab)

How to fix?

Upgrade Alpine:3.16 xen to version 4.15.0-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.

inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.

CVSS Scores

version 3.1