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 vfiopcicorefeaturedmabuf() ignores its own advice to only use dmabufput() after dmabuf_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.