CVE-2021-27379 — Vulnetix

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CVE-2021-27379 PUBLISHED

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.

EPSS 0.07% · 21.4th percentile

Risk Scores

EPSS Score

0.07%

21.4th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:20.04:LTS	xen	4.11.3+24-g14b62ab3e5-1ubuntu1, ,
Ubuntu:22.04:LTS	xen	0, 4.16.0-1~ubuntu2.1, 4.16.0-1~ubuntu2
Ubuntu:24.04:LTS	xen	4.17.2+76-ge1f9cb16e2-1ubuntu1, 4.17.2+76-ge1f9cb16e2-1, 4.17.2+55-g0b56bed864-1
Ubuntu:25.10	xen	0, 4.20.0-1ubuntu1, 4.20.0+68-g35cb38b222-1
Ubuntu:16.04:LTS	xen	4.6.0-1ubuntu2, 4.5.1-0ubuntu1, 0
Ubuntu:18.04:LTS	xen	4.9.2-0ubuntu1, 0, 4.9.0-0ubuntu4

Timeline

Feb 18, 2021 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Oct 24, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Feb 4, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 1, 2022 EPSS Score
Apr 28, 2022 EPSS Score
Jun 29, 2022 EPSS Score
Aug 31, 2022 EPSS Score

References

https://ubuntu.com/security/CVE-2021-27379 third-party-advisory
https://xenbits.xen.org/xsa/advisory-366.html third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2021-27379 third-party-advisory

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