What is CVE-2025-39727?

CVE-2025-39727 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.12 onward and patched in 6.12.42, 6.15.10, 6.16.1 and others. CVE-2025-39727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39727?

CVE-2025-39727 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-39727?

Yes, CVE-2025-39727 has been patched. Fixed versions include 6.12.42, 6.15.10, 6.16.1 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39727 actively exploited?

CVE-2025-39727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39727

High

In the Linux kernel, the following vulnerability has been resolved: mm: swap: fix potential buffer overflow in setup_clusters() In setup_swap_map(), we only ensure badpages are in range (0, last_page]. As maxpages might be < last_page, setup_clusters() will encounter a buffer overflow when a badpage is >= maxpages. Only call inc_cluster_info_page() for badpage which is < maxpages to fix the issue.

Package Linux Kernel

Published 2025-09-07

Last modified 2025-11-25

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-120

CVE-2025-39727 is classified as CWE-120

See CWE-120 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.12 and later are affected. Fixed in 6.12.42, 6.15.10, 6.16.1, 6.17 and their respective stable series.

Affected from

≥ 6.12

Fixed in

✓ 6.12.42 6.12.x ✓ 6.15.10 6.15.x ✓ 6.16.1 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39727 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/152c1339dc13ad46f1b136e8693de15980750835
Patch
Kernel patch commit
https://git.kernel.org/stable/c/815c528b13f2bb9b3130c13bedeabf2351a68129
Patch
Kernel patch commit
https://git.kernel.org/stable/c/91b370800b3f2b3dda244c0ab06719c4971190a5
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-39727

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-09-07

Modified 2025-11-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39727?

CVE-2025-39727 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.12 onward and has been patched in 6.12.42, 6.15.10, 6.16.1 and others. CVE-2025-39727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39727?

CVE-2025-39727 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-39727?

Yes — CVE-2025-39727 has been patched. Fixed versions include 6.12.42, 6.15.10, 6.16.1 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39727 actively exploited?

No — CVE-2025-39727 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.