CVE-2021-27379

Description

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.

7.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.29%

Vendor Advisory debian.org Vendor Advisory xen.org Vendor Advisory xen.org

Affected: n/a n/a

References

Link	Tags
http://xenbits.xen.org/xsa/advisory-366.html	patch vendor advisory mitigation
https://xenbits.xen.org/xsa/advisory-366.html	patch vendor advisory
http://www.openwall.com/lists/oss-security/2021/02/23/1	third party advisory mailing list
https://www.debian.org/security/2021/dsa-4888	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-27379?: CVE-2021-27379 has been scored as a high severity vulnerability.
How to fix CVE-2021-27379?: To fix CVE-2021-27379, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-27379 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-27379 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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