---
id: CVE-2026-64042
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vfio/pci: Check BAR resources before exporting a DMABUF

  A DMABUF exports access to BAR resources and, although they are
  requested at startup time, we need to ensure th…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vfio/pci: Check BAR resources before exporting a DMABUF

  A DMABUF exports access to BAR resources and, although they are
  requested at startup time, we need to ensure th…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.19, < 7.0.11'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.11
published: '2026-07-19'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T18:22:30.963'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64042'
references:
  - url: 'https://git.kernel.org/stable/c/702809dabdecca807bdd50cfdcc1c980feb2ba62'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8443cd4497a4498c4b01058d76a92116244cb605'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00165
epssPercentile: 0.0516
ingestedAt: '2026-10-05T18:29:11.174Z'
---

## Overview

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

vfio/pci: Check BAR resources before exporting a DMABUF

A DMABUF exports access to BAR resources and, although they are
requested at startup time, we need to ensure they really were reserved
before exporting.  Otherwise, it's possible to access unreserved
resources through the export.

Add a check to the DMABUF-creation path.

## Affected

- `linux_kernel >= 6.19, < 7.0.11`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.11`