CVE-2021-27379 — Improper Privilege Management in XEN

CWE-269 — Improper Privilege Management4 documents4 sources
Severity
7.8HIGHNVD
OSV8.8
EPSS
0.1%
top 78.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
XENDebian XENDebian Linux
Timeline
PublishedFeb 18
Latest updateMay 24

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages3 packages

▶NVDxen/xen3.2.0 — 4.12.0
▶debiandebian/xen< xen 4.14.0+80-gd101b417b7-1 (bookworm)
▶Debianxen/xen< 4.14.0+80-gd101b417b7-1+3

Also affects: Debian Linux 10.0

Patches

Patch: xenbits.xen.org ↗Patch: xenbits.xen.org ↗Patch: xenbits.xen.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-f444-f4gw-jhg6: An issue was discovered in Xen through 4↗2022-05-24
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OSV
CVE-2021-27379: An issue was discovered in Xen through 4↗2021-02-18
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📋Vendor Advisories

1
Debian
CVE-2021-27379: xen - An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS u...↗2021
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