🛡️ CVE-2025-38085
🟡 CVSS 4.7 — Medium ✅ No Known Exploit CWE-362 NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity MEDIUM
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-362
Public Exploit ✅ No
Source NVD
Published 2025-06-28
Updated 2026-06-02
Modified 2025-12-18

Affected Packages

Software From version Fixed in
debian-linux — —
linux-kernel 6.13 6.15.4

References

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