CVE-2025-40040

CVE-2025-40040 is a Linux kernel vulnerability arising from the mm/ksm: fix flag-dropping behavior in ksm_madvise. The issue causes an UFFD inconsistency in userfaultfd Release paths when a VMA registered for UFFD in MINOR mode undergoes MADV_UNMEARGEABLE, inadvertently clearing the upper 32 bits...