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

KVM: SEV: Fix page dirtying in sev_gmem_post_populate()

set_page_dirty() requires that the caller holds some kind of lock to
ensure that the page's mapping does not concurrently go away.
That is not the case for a random page we got from get_user_pages_fast(),
so use set_page_dirty_lock().

[sean: tag for stable]