CVE-2021-27379

HIGH7.8

An issue was discovered in Xen through 4

Published Feb 18, 2021

Modified 1 years ago

No fix available

Details

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.

References

WEBhttp://www.openwall.com/lists/oss-security/2021/02/23/1 WEBhttp://xenbits.xen.org/xsa/advisory-366.html ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2021-27379 ADVISORYhttps://www.debian.org/security/2021/dsa-4888 WEBhttps://xenbits.xen.org/xsa/advisory-366.html

CVSS Analysis

CVSS v3.1

7.8

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

7.8/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Ecosystems

Timeline

PublishedFeb 18, 2021

ModifiedAug 3, 2024