CVE-2021-27379

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 v3 7.8 HIGH
CVSS v2.0 5.9 MEDIUM

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

5.9^/10

CVSS v2.0 : MEDIUM

Vector : AV:L/AC:M/Au:N/C:P/I:P/A:C

Exploitability : 3.4 / Impact : 8.5

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact COMPLETE

References

Link	Resource
http://www.openwall.com/lists/oss-security/2021/02/23/1	Mailing List Third Party Advisory
http://xenbits.xen.org/xsa/advisory-366.html	Mitigation Patch Vendor Advisory
https://www.debian.org/security/2021/dsa-4888	Third Party Advisory
https://xenbits.xen.org/xsa/advisory-366.html	Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/02/23/1	Mailing List Third Party Advisory
http://xenbits.xen.org/xsa/advisory-366.html	Mitigation Patch Vendor Advisory
https://www.debian.org/security/2021/dsa-4888	Third Party Advisory
https://xenbits.xen.org/xsa/advisory-366.html	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-02-18 17:15

Updated : 2024-11-21 05:57

NVD link : CVE-2021-27379

Mitre link : CVE-2021-27379

CVE.ORG link : CVE-2021-27379

JSON object : View

Products Affected

xen

xen

debian

debian_linux

CWE

NVD-CWE-Other

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