CVEvulnerability
CVE-2021-27379
7.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-02-18
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 5.9 MEDIUM — AV:L/AC:M/Au:N/C:P/I:P/A:C
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.
Affected configurations
• xen xen (>= 3.2.0 < 4.12.0)
• debian debian linux 10.0
References
- http://www.openwall.com/lists/oss-security/2021/02/23/1 Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-366.html Mitigation, Patch, Vendor Advisory
- https://www.debian.org/security/2021/dsa-4888 Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-366.html Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/02/23/1 Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-366.html Mitigation, Patch, Vendor Advisory
- https://www.debian.org/security/2021/dsa-4888 Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-366.html Patch, Vendor Advisory