CVE-2025-38085
Linux Kernel: Huge Page Table Unshare Race Condition Vulnerability
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.
INFO
Published Date :
June 28, 2025, 8:15 a.m.
Last Modified :
June 28, 2025, 8:15 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f Added Reference https://git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d Added Reference https://git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec Added Reference https://git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185 Added Reference https://git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 Added Reference https://git.kernel.org/stable/c/b7754d3aa7bf9f62218d096c0c8f6c13698fac8b Added Reference https://git.kernel.org/stable/c/fe684290418ef9ef76630072086ee530b92f02b8
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38085 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-38085
weaknesses.