Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | >= 3.2.0, < 4.12.0 |
| Debian | Debian Linux | 10.0 |
References
- http://www.openwall.com/lists/oss-security/2021/02/23/1Mailing ListThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-366.htmlMitigationPatchVendor Advisory
- https://www.debian.org/security/2021/dsa-4888Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-366.htmlPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/02/23/1Mailing ListThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-366.htmlMitigationPatchVendor Advisory
- https://www.debian.org/security/2021/dsa-4888Third Party Advisory
- https://xenbits.xen.org/xsa/advisory-366.htmlPatchVendor Advisory
FAQ
What is CVE-2021-27379?
CVE-2021-27379 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 privile...
How severe is CVE-2021-27379?
CVE-2021-27379 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-27379?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Debian Debian Linux.