CVE-2026-43045

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

mshv: Fix error handling in mshv_region_pin

The current error handling has two issues:

First, pin_user_pages_fast() can return a short pin count (less than

requested but greater than zero) when it cannot pin all requested pages.

This is treated as success, leading to partially pinned regions being

used, which causes memory corruption.

Second, when an error occurs mid-loop, already pinned pages from the

current batch are not properly accounted for before calling

mshv_region_invalidate_pages(), causing a page reference leak.

Treat short pins as errors and fix partial batch accounting before

cleanup.