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

net: ena: fix MMIO read buffer leak on probe failure

ena device init() initializes the MMIO read mechanism with ena com mmio reg read request init(), which allocates a coherent DMA buffer for MMIO read responses.

The normal removal path releases this buffer through ena com mmio reg read request destroy(). However, if ena probe() fails after ena device init() succeeds, the error path destroys the admin resources and eventually frees ena dev without destroying the MMIO read request, leaving the coherent DMA buffer allocated.

Call ena com mmio reg read request destroy() in the probe error path before releasing the remaining device resources.

This issue was found by manual code inspection.