Answer in brief
CVE-2025-38085 records a High severity (CVSS 7.8) vulnerability in mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <952596b08c74e8fe9e2883d1dc8a8f54a37384ec || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <a3d864c901a300c295692d129159fc3001a56185 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <b7754d3aa7bf9f62218d096c0c8f6c13698fac8b || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <fe684290418ef9ef76630072086ee530b92f02b8 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <034a52b5ef57c9c8225d94e9067f3390bb33922f || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <1013af4f585fccc4d3e5c5824d174de2257f7d6d | 952596b08c74e8fe9e2883d1dc8a8f54a37384ec, a3d864c901a300c295692d129159fc3001a56185, b7754d3aa7bf9f62218d096c0c8f6c13698fac8b, fe684290418ef9ef76630072086ee530b92f02b8, 034a52b5ef57c9c8225d94e9067f3390bb33922f, a6bfeb97941a9187833b526bc6cc4ff5706d0ce9, 1013af4f585fccc4d3e5c5824d174de2257f7d6d |
| Linux/Linuxgeneric | 2.6.20 | Not reported |
Published upstream
Jun 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in which unrelated VMAs can afterwards be installed. If this happens in the middle of a concurrent gup_fast(), gup_fast() could end up walking the page tables of another process. While I don't see any way in which that immediately leads to kernel memory corruption, it is really weird and unexpected. Fix it with an explicit broadcast IPI through tlb_remove_table_sync_one(), just like we do in khugepaged when removing page tables for a THP collapse.
Quoted source text, attributed separately from HOL analysis.