Improper Privilege Management Affecting xen package, versions <4.11.4+99-g8bce4698f6-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-DEBIAN10-XEN-1076765
  • published19 Feb 2021
  • disclosed18 Feb 2021

Introduced: 18 Feb 2021

CVE-2021-27379  (opens in a new tab)
CWE-269  (opens in a new tab)

How to fix?

Upgrade Debian:10 xen to version 4.11.4+99-g8bce4698f6-1 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 Debian. See How to fix? for Debian:10 relevant fixed versions and status.

An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.

CVSS Scores

version 3.1