CVE-2025-21984

CVE-2025-21984 affects the Linux kernel (mm/userfaultfd_move and swapcache handling). The issue occurs when userfaultfd_move treats a PTE as a swap entry without updating the folio’s destination index, creating a race window between swap PTE moves and swapcache invalidate/folio migration. In this...

CVE-2025-21984

In the Linux kernel, the following vulnerability has been resolved: mm: fix kernel BUG when userfaultfdmove encounters swapcache userfaultfdmove checks whether the PTE entry is present or a swap entry. - If the PTE entry is present, movepresentpte handles folio migration by setting: srcfolio-inde...