CVE-2026-31468

A flaw was found in the Linux kernel's vfio/pci dma-buf feature. An issue in the error handling of the vfio_pci_core_feature_dma_buf() function can lead to a double free of allocated memory. This can occur under specific conditions, such as file descriptor exhaustion, potentially causing system instability or a denial of service (DoS).

Upstream corrected refcount handling on the dma-buf export error path to prevent double free and device refcount imbalance. Red Hat treats this as a local VFIO PCI hardening issue reachable only under resource pressure. Apply updated kernels; optionally unload vfio_pci where VFIO assignment is unused.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the vfio_pci module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.