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CVE-2025-38085 is a race condition in the Linux kernel hugetlb memory-management subsystem. The huge_pmd_unshare() path can drop a reference to a page table formerly shared across processes. That page table can then be repurposed as a normal page table in a different process and populated with unrelated virtual memory areas while a concurrent GUP-fast page-table walk is still in progress. GUP-fast can consequently traverse page tables belonging to another process. The upstream fix synchronizes page-table removal using an explicit broadcast IPI through tlb_remove_table_sync_one(), consistent with the approach used for khugepaged transparent-huge-page collapse.
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Linux kernel hugetlb race condition between huge_pmd_unshare() and GUP-fast.
Linux kernel memory-management race condition between huge_pmd_unshare() and GUP-fast in hugetlb handling.
A race condition in the Linux kernel hugetlb memory-management code involving huge_pmd_unshare() and GUP-fast.
A race condition in the Linux kernel memory-management hugetlb code involving huge_pmd_unshare() and GUP-fast.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.