CVE-2021-27379

published 2021-02-18

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…

Priority P3 37 high 7.8 CVSS 3.1

AV L AC L PR L UI N S U C H I H A H

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

7 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	xen	< xen 4.14.0+80-gd101b417b7-1 (bookworm)	xen 4.14.0+80-gd101b417b7-1 (bookworm)
xen	xen	>= 0 < 4.14.0+80-gd101b417b7-1	4.14.0+80-gd101b417b7-1
xen	xen	>= 0 < 4.14.0+80-gd101b417b7-1	4.14.0+80-gd101b417b7-1
xen	xen	>= 0 < 4.14.0+80-gd101b417b7-1	4.14.0+80-gd101b417b7-1
xen	xen	>= 0 < 4.14.0+80-gd101b417b7-1	4.14.0+80-gd101b417b7-1
xen	xen	>= 3.2.0 < 4.12.0	4.12.0

CVSS provenance

nvd v3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 5.9 MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:C

osv 8.8 HIGH

vendor_debian 8.8 HIGH

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