CVE-2021-27379

Summary:

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.

Reference Links(if available):

https://xenbits.xen.org/xsa/advisory-366.html

http://www.openwall.com/lists/oss-security/2021/02/23/1

http://xenbits.xen.org/xsa/advisory-366.html

https://www.debian.org/security/2021/dsa-4888

CVSS Score (if available)

v2: / MEDIUMAV:L/AC:M/Au:N/C:P/I:P/A:C

v3: / HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Links to Exploits(if available)