Bug 2502547 (CVE-2026-64042) - CVE-2026-64042 kernel: vfio/pci: Check BAR resources before exporting a DMABUF
Summary: CVE-2026-64042 kernel: vfio/pci: Check BAR resources before exporting a DMABUF
Keywords:
Status: NEW
Alias: CVE-2026-64042
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 17:05 UTC by OSIDB Bzimport
Modified: 2026-09-08 11:35 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:65334 0 None None None 2026-09-08 11:35:23 UTC

Description OSIDB Bzimport 2026-07-19 17:05:27 UTC 
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.
Comment 1 TEJ RATHI 2026-07-20 13:47:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071906-CVE-2026-64042-c30f@gregkh/T
Comment 5 errata-xmlrpc 2026-09-08 11:35:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65334 https://access.redhat.com/errata/RHSA-2026:65334
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