CVE-2026-31468

In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Fix double free in dma-buf feature

The error path through vfio_pci_core_feature_dma_buf() ignores its

own advice to only use dma_buf_put() after dma_buf_export(), instead

falling through the entire unwind chain. In the unlikely event that

we encounter file descriptor exhaustion, this can result in an

unbalanced refcount on the vfio device and double free of allocated

objects.

Avoid this by moving the "put" directly into the error path and return

the errno rather than entering the unwind chain.