High [CVE-2026-53322] Clean up DMABUFs before disabling function
This high-severity Red Hat Linux advisory covers CVE-2026-53322 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
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. During device shutdown, an improper order of operations in cleaning up Direct Memory Access Buffers (DMABUFs) before disabling the function creates a brief window.
In this window, a device's Base Address Registers (BARs) could still be accessed via DMABUFs even after memory space enable (MSE) is cleared. This could potentially allow a different driver to access freed resources, leading to information disclosure or unauthorized resource access.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-826.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat fixing advisory: RHSA-2026:65334.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- kernel-0:6.12.0-211.53.1.el10_2
- RHSA-2026:65334
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation checklist
- To mitigate this issue, if PCI device passthrough is not required, the `vfio_pci` kernel module can be blacklisted to prevent it from loading. This can be achieved by creating a file such as `/etc/modprobe.d/blacklist-vfio-pci.conf` with the content `blacklist vfio_pci`. A system reboot is required for this change to take effect. Disabling this module may impact functionality that relies on PCI device passthrough.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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