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CVE-2021-27379

Date: February 18, 2021

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.

Severity Score

Related Resources (7)

http://xenbits.xen.org/xsa/advisory-366.html
https://security-tracker.debian.org/tracker/CVE-2021-27379
https://xenbits.xen.org/xsa/advisory-366.html
https://nvd.nist.gov/vuln/detail/CVE-2021-27379
http://www.openwall.com/lists/oss-security/2021/02/23/1
https://www.debian.org/security/2021/dsa-4888
https://www.mend.io/vulnerability-database/CVE-2021-27379

Severity Score

Weakness Type (CWE)

Improper Privilege Management

CWE-269

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): COMPLETE
Additional information:

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