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CVE-2025-38085— mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于huge_pmd_unshare与GUP-fast竞争，可能导致页表共享问题。

CVSS 7.8 · High EPSS 0.16% · P4

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< 952596b08c74e8fe9e2883d1dc8a8f54a37384ec affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< a3d864c901a300c295692d129159fc3001a56185 affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< b7754d3aa7bf9f62218d096c0c8f6c13698fac8b affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< fe684290418ef9ef76630072086ee530b92f02b8 affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< 034a52b5ef57c9c8225d94e9067f3390bb33922f affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 affected
39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa< 1013af4f585fccc4d3e5c5824d174de2257f7d6d affected
2.6.20 affected
… +8 more rows
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I. Basic Information for CVE-2025-38085

Vulnerability Information
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Vulnerability Title
mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于huge_pmd_unshare与GUP-fast竞争，可能导致页表共享问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa ~ 952596b08c74e8fe9e2883d1dc8a8f54a37384ec -
Linux Linux 2.6.20 -

II. Public POCs for CVE-2025-38085

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III. Intelligence Information for CVE-2025-38085

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Same Patch Batch · Linux · 2025-06-28 · 3 CVEs total

CVE-2025-38084 7.8 HIGH mm/hugetlb: unshare page tables during VMA split, not before
CVE-2025-38086 net: ch9200: fix uninitialised access during mii_nway_restart

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38085

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