CVE-2021-27379
7.8
HIGH
CVSS 3.1
EPSS 0.07%
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.
How to fix CVE-2021-27379
To remediate CVE-2021-27379, upgrade the affected package to a fixed version below.
- —upgrade to 4.14.0+80-gd101b417b7-1 or later
Is CVE-2021-27379 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 4.14.0+80-gd101b417b7-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |