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userfaultfd

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    CVE-2025-21696: Linux Kernel uffd_wp mremap Bug and Patch Guide

    The Linux kernel vulnerability tracked as CVE-2025-21696 — described upstream as “mm: clear uffd-wp PTE/PMD state on mremap” — is a correctness bug in the kernel’s memory-management paths that can produce kernel warnings, oopses, and denial-of-service conditions when specific userfaultfd and...
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    • cve 2025 21696 linux kernel memory management userfaultfd
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    • Forum: Security Alerts
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    Linux Kernel Patch Fixes KSM Madvise Flag Bug (CVE-2025-40040)

    The Linux kernel patch addressing CVE-2025-40040 fixes a subtle but consequential flag-dropping bug in the KSM madvise path: under specific 64-bit builds a bitwise operation in ksm_madvise could inadvertently clear the upper 32 bits of a VMA’s vm_flags, removing userfaultfd (UFFD) flags and...
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