What is CVE-2021-27379?

CVE-2021-27379 is a high-severity vulnerability in Xen. CVSS score: 7.8/10. Published 2021-02-18.

How severe is CVE-2021-27379?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Xen

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.

EPSS: 0.004 (28.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Xen
Debian Debian_linux — versions 10.0
N/a — versions n/a

References

cve@mitre.org (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)
cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)
cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)

Frequently asked questions

What is CVE-2021-27379?: CVE-2021-27379 is a high-severity vulnerability in Xen. CVSS score: 7.8/10. Published 2021-02-18.
How severe is CVE-2021-27379?: High severity. CVSS v3 base score is 7.8 out of 10.