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CVE-2025-38686
userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry
Description

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check. [[email protected]: remove extra folio check, per David]

INFO

Published Date :

Sept. 4, 2025, 4:15 p.m.

Last Modified :

Sept. 5, 2025, 5:47 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-38686 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
: Total Affected Vendor : 1 | Products : 1
Solution
Address a kernel crash by checking migration PMD entries during UFFDIO_MOVE operations.
  • Check for migration PMD entries in UFFDIO_MOVE.
  • Allow split_huge_pmd() to handle migration entries.
  • Remove unnecessary folio checks.
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-2025-38686.

URL Resource
https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38686 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-2025-38686 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-2025-38686 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-2025-38686 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.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check. [[email protected]: remove extra folio check, per David]
    Added Reference https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
    Added Reference https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
    Added Reference https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
    Added Reference https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a
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
No CVSS metrics available for this vulnerability.