---
id: CVE-2021-46967
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

  The virtqueue doorbell is usually implemented via registeres but we
  don't provide the necessary vma->flags like…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

  The virtqueue doorbell is usually implemented via registeres but we
  don't provide the necessary vma->flags like…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.8, < 5.10.36'
  - 'linux_kernel >= 5.11, < 5.11.20'
  - 'linux_kernel >= 5.12, < 5.12.3'
patched:
  - linux_kernel 5.12.3
published: '2024-02-27'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-46967'
references:
  - url: 'https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00231
epssPercentile: 0.12446
ingestedAt: '2026-08-04T10:39:38.615Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

The virtqueue doorbell is usually implemented via registeres but we
don't provide the necessary vma->flags like VM_PFNMAP. This may cause
several issues e.g when userspace tries to map the doorbell via vhost
IOTLB, kernel may panic due to the page is not backed by page
structure. This patch fixes this by setting the necessary
vm_flags. With this patch, try to map doorbell via IOTLB will fail
with bad address.

## Affected

- `linux_kernel >= 5.8, < 5.10.36`
- `linux_kernel >= 5.11, < 5.11.20`
- `linux_kernel >= 5.12, < 5.12.3`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.12.3`