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CVE-2025-38085 is a race condition in the Linux kernel hugetlb memory-management subsystem involving huge_pmd_unshare() and concurrent GUP-fast execution. Dropping a reference to a formerly shared page table can allow that table to become a normal page table in another process, where unrelated virtual memory areas may subsequently be installed. A concurrent gup_fast() operation can consequently traverse page tables belonging to the wrong process. The issue was introduced in Linux 2.6.20. The fix synchronizes page-table removal using an explicit broadcast interprocessor interrupt through tlb_remove_table_sync_one().
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A Linux kernel race condition between huge_pmd_unshare() and GUP-fast can cause a page-table walk to traverse another process's page tables. The fix introduces explicit synchronization through tlb_remove_table_sync_one(). The reference assigns CVSS v3 severity of 4.7, describing local access, high attack complexity, low privileges, and potential availability impact; it does not establish immediate kernel memory corruption.
A locally exploitable, high-complexity vulnerability requiring low privileges that can affect availability, with no stated confidentiality or integrity impact.
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.
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Cross-references every affected SKU, including bundled OEM variants.
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