CVE-2026-53322
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk7th percentile — higher than 7% of all known CVEs
Summary
In the Linux kernel, a vulnerability in the VFIO/PCI driver causes improper cleanup order during device shutdown. DMABUFs are not cleared before the PCI function is disabled, leaving a window where BARs remain accessible via DMABUF after MSE is cleared, and resources could be claimed by another driver.
Risk Assessment
The risk involves potential unauthorized access to PCI memory (BARs) via DMABUF after function disable, which could lead to data integrity violations or privilege escalation in virtualized environments.
Recommendation
Immediately update the Linux kernel to a version containing the fix that reorders calls in vfio_pci_core_close_device() – first cleanup DMABUFs, then disable the function.
Original NVD description (English source)
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.