Xen Certain VT-d IOMMUs May Not Work In Shared Page Table Mode (XSA-390)

high Nessus Plugin ID 156325


The remote Xen hypervisor installation is missing a security update.


According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a vulnerability in the IOMMU that fails to strip tables in shared page table mode. The vulnerability only affects x86 Intel systems. A local, authorized attacker could use this vulnerability to escalate from guest to host privilages.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Apply the appropriate patch according to the vendor advisory.

See Also


Plugin Details

Severity: High

ID: 156325

File Name: xen_server_XSA-390.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 12/28/2021

Updated: 11/21/2022

Configuration: Enable paranoid mode

Risk Information


Risk Factor: High

Score: 7.3


Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-28710


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:xen:xen

Required KB Items: installed_sw/Xen Hypervisor, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 11/19/2021

Vulnerability Publication Date: 11/19/2021

Reference Information

CVE: CVE-2021-28710

IAVB: 2021-B-0068-S