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

vhost/vdpa: validate virtqueue index in mmap and fault paths

vhost_vdpa_mmap() and vhost_vdpa_fault() use vma->vm_pgoff as a
virtqueue index for get_vq_notification(), but they do not validate
that the index is smaller than v->nvqs.

The ioctl path already performs both a bounds check and
array_index_nospec(), but the mmap/fault path only checks that the
index fits in u16. This allows an out-of-range queue index to reach
driver-specific get_vq_notification() callbacks.

Fix this by extracting a unified vhost_vdpa_get_vq_notification()
helper that validates the queue index against v->nvqs and applies
array_index_nospec() before calling the driver callback. Both the
mmap and fault paths use this helper, and the bounds checking is
consolidated into a single location.

From source inspection, the most defensible impact is out-of-bounds
access in the callback path, potentially leading to invalid PFN
remaps and crash/DoS.

https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17

https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e

https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183

https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d

https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550

https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f

https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b

https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8

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