What is CVE-2025-38686?

CVE-2025-38686 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.8 onward and patched in 6.12.43, 6.15.11, 6.16.2 and others. CVE-2025-38686 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-38686?

CVE-2025-38686 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-38686?

Yes, CVE-2025-38686 has been patched. Fixed versions include 6.12.43, 6.15.11, 6.16.2 and others. If you are running Linux kernel 6.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-38686 actively exploited?

CVE-2025-38686 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-38686

Medium

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]

Package Linux Kernel

Published 2025-09-04

Last modified 2025-11-24

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 6.8 and later are affected. Fixed in 6.12.43, 6.15.11, 6.16.2, 6.17 and their respective stable series.

Affected from

≥ 6.8

Fixed in

✓ 6.12.43 6.12.x ✓ 6.15.11 6.15.x ✓ 6.16.2 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-38686 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
Patch
Kernel patch commit
https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
Patch
Kernel patch commit
https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-38686

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-09-04

Modified 2025-11-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-38686?

CVE-2025-38686 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.8 onward and has been patched in 6.12.43, 6.15.11, 6.16.2 and others. CVE-2025-38686 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-38686?

CVE-2025-38686 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-38686?

Yes — CVE-2025-38686 has been patched. Fixed versions include 6.12.43, 6.15.11, 6.16.2 and others. If you are running Linux kernel 6.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-38686 actively exploited?

No — CVE-2025-38686 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.