Bug 2493709 (CVE-2026-53322) - CVE-2026-53322 kernel: vfio/pci: Clean up DMABUFs before disabling function
Summary: CVE-2026-53322 kernel: vfio/pci: Clean up DMABUFs before disabling function
Keywords:
Status: NEW
Alias: CVE-2026-53322
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-26 21:02 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 11:35:14 UTC

Description OSIDB Bzimport 2026-06-26 21:02:07 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Clean up DMABUFs before disabling function

On device shutdown, make vfio_pci_core_close_device() call
vfio_pci_dma_buf_cleanup() before the function is disabled via
vfio_pci_core_disable().  This ensures that all access via DMABUFs is
revoked before the function's BARs become inaccessible.

This fixes an issue where, if the function is disabled first, a tiny
window exists in which the function's MSE is cleared and yet BARs
could still be accessed via the DMABUF.  The resources would also be
freed and up for grabs by a different driver.
Comment 1 Mauro Matteo Cascella 2026-06-29 10:33:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062622-CVE-2026-53322-843f@gregkh/T
Comment 7 errata-xmlrpc 2026-09-08 11:35:13 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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