CVE-2025-38686 — userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migrati…
Published: 2025-09-04 · CVSS: Unscored
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check. [surenb@google.com: remove extra folio check, per David]
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7