VDB
CVE-2021-27379
CVE-2021-27379
PUBLISHED
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.
EPSS 0.07% · 21.7th percentile
Risk Scores
EPSS Score
0.07%
21.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:20.04:LTS | xen | 0, *, * |
| Ubuntu:22.04:LTS | xen | 4.11.4+24-gddaaccbbab-1ubuntu2, 4.16.0-1~ubuntu2.1, 4.16.0-1~ubuntu2 |
| Ubuntu:24.04:LTS | xen | 4.17.2+76-ge1f9cb16e2-1ubuntu1, 0, 4.17.2-1 |
| Ubuntu:25.10 | xen | 0, 4.20.0+68-g35cb38b222-1, 4.20.0-1ubuntu1 |
| Ubuntu:16.04:LTS | xen | 4.6.0-1ubuntu2, 0, 4.6.0-1ubuntu4.1 |
| Ubuntu:18.04:LTS | xen | 4.9.0-0ubuntu4, 0, 4.9.2-0ubuntu1 |
Timeline
- Feb 18, 2021 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Sep 4, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-27379 third-party-advisory
- https://xenbits.xen.org/xsa/advisory-366.html third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-27379 third-party-advisory