CVE-2021-47461

In the Linux kernel, the following vulnerability has been resolved:
userfaultfd: fix a race between writeprotect and exit_mmap() A race is
possible when a process exits, its VMAs are removed by exit_mmap() and at
the same time userfaultfd_writeprotect() is called. The race was detected
by KASAN on a development kernel, but it appears to be possible on vanilla
kernels as well. Use mmget_not_zero() to prevent the race as done in other
userfaultfd operations.