What is the severity of CVE-2021-27379?

CVE-2021-27379 is classified as a high severity vulnerability due to its potential to cause denial of service or privilege escalation.

How do I fix CVE-2021-27379?

To fix CVE-2021-27379, upgrade Xen to a version that is not affected, such as 4.11.4+107-gef32c7afa2-1 or later.

What systems are impacted by CVE-2021-27379?

CVE-2021-27379 affects Xen versions up to and including 4.11.x, specifically on x86 Intel HVM guest OS installations.

Can CVE-2021-27379 lead to a host OS crash?

Yes, CVE-2021-27379 can potentially allow a denial of service condition, leading to a host OS crash.

What causes CVE-2021-27379?

CVE-2021-27379 results from a missed flush in a backport, leading to incorrect IOMMU updates and unintended DMA access.

Vulnerability/
CVE-2021-27379

high

7.8

18/2/2021

3/8/2024

CVE-2021-27379

First published: Thu Feb 18 2021(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
debian/xen		4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1
Xen xen-unstable	>=3.2.0<4.12.0
Debian GNU/Linux	=10.0

Remedy

http://xenbits.xen.org/xsa/advisory-366.html

Remedy

https://xenbits.xen.org/xsa/advisory-366.html

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-27379?
CVE-2021-27379 is classified as a high severity vulnerability due to its potential to cause denial of service or privilege escalation.
How do I fix CVE-2021-27379?
To fix CVE-2021-27379, upgrade Xen to a version that is not affected, such as 4.11.4+107-gef32c7afa2-1 or later.
What systems are impacted by CVE-2021-27379?
CVE-2021-27379 affects Xen versions up to and including 4.11.x, specifically on x86 Intel HVM guest OS installations.
Can CVE-2021-27379 lead to a host OS crash?
Yes, CVE-2021-27379 can potentially allow a denial of service condition, leading to a host OS crash.
What causes CVE-2021-27379?
CVE-2021-27379 results from a missed flush in a backport, leading to incorrect IOMMU updates and unintended DMA access.

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