Vulnerability Details : 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.
Vulnerability category: Denial of service
Products affected by CVE-2021-27379
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27379
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27379
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.9
|
MEDIUM | AV:L/AC:M/Au:N/C:P/I:P/A:C |
3.4
|
8.5
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
References for CVE-2021-27379
-
https://xenbits.xen.org/xsa/advisory-366.html
XSA-366 - Xen Security AdvisoriesPatch;Vendor Advisory
-
http://xenbits.xen.org/xsa/advisory-366.html
XSA-366 - Xen Security AdvisoriesMitigation;Patch;Vendor Advisory
-
http://www.openwall.com/lists/oss-security/2021/02/23/1
oss-security - Xen Security Advisory 366 v2 (CVE-2021-27379) - missed flush in XSA-321 backportMailing List;Third Party Advisory
-
https://www.debian.org/security/2021/dsa-4888
Debian -- Security Information -- DSA-4888-1 xenThird Party Advisory
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