In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIOMOVE when PMD is a migration entry When UFFDIOMOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swpentryt. Add the missing check and let splithugepmd() handle migration entries. While at it also remove unnecessary folio check. [surenb@google.com: remove extra folio check, per David]