1. Home
  2. Vulnerabilities
  3. CVE-2025-38085
4.7
MEDIUM CVSS 3.1
CVE-2025-38085
mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race
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 :

Dec. 18, 2025, 9:21 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-38085 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
1 Debian debian_linux
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Address a race condition in the Linux kernel's huge page handling.
  • Update the Linux kernel to the latest stable version.
  • Apply the specific patch for the hugetlb race condition.
  • Ensure proper synchronization in page table operations.
  • Test system stability after the update.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38085.

URL Resource
https://git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f Patch
https://git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d Patch
https://git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec Patch
https://git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185 Patch
https://git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 Patch
https://git.kernel.org/stable/c/b7754d3aa7bf9f62218d096c0c8f6c13698fac8b Patch
https://git.kernel.org/stable/c/fe684290418ef9ef76630072086ee530b92f02b8 Patch
https://project-zero.issues.chromium.org/issues/420715744 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
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.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38085 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-38085 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 18, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-362
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.186 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.142 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.95 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.20 up to (excluding) 5.10.239 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.15.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.35
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b7754d3aa7bf9f62218d096c0c8f6c13698fac8b Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/fe684290418ef9ef76630072086ee530b92f02b8 Types: Patch
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Types: Third Party Advisory
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Types: Third Party Advisory
    Added Reference Type kernel.org: https://project-zero.issues.chromium.org/issues/420715744 Types: Third Party Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 30, 2025

    Action Type Old Value New Value
    Added Reference https://project-zero.issues.chromium.org/issues/420715744
  • 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
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 4.7
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact