{"cve":"CVE-2025-38085","nvd":{"published":"2025-06-28T08:15:24.843","modified":"2026-07-30T06:22:49.527","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race\n\nhuge_pmd_unshare() drops a reference on a page table that may have\npreviously been shared across processes, potentially turning it into a\nnormal page table used in another process in which unrelated VMAs can\nafterwards be installed.\n\nIf this happens in the middle of a concurrent gup_fast(), gup_fast() could\nend up walking the page tables of another process.  While I don't see any\nway in which that immediately leads to kernel memory corruption, it is\nreally weird and unexpected.\n\nFix it with an explicit broadcast IPI through tlb_remove_table_sync_one(),\njust like we do in khugepaged when removing page tables for a THP\ncollapse.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["https://git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f","https://git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d","https://git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec","https://git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185","https://git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2025-38085","score":0.00156,"percentile":0.04768,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}