What is CVE-2025-39872?

CVE-2025-39872 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.12.63 onward and patched in 6.12.64, 6.16.8 and 6.17. CVE-2025-39872 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39872?

CVE-2025-39872 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-2025-39872?

Yes, CVE-2025-39872 has been patched. Fixed versions include 6.12.64, 6.16.8 and 6.17. If you are running Linux kernel 6.12.63 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39872 actively exploited?

CVE-2025-39872 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39872

Medium

In the Linux kernel, the following vulnerability has been resolved: hsr: hold rcu and dev lock for hsr_get_port_ndev hsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock. On the other hand, before return the port device, we need to hold the device reference to avoid UaF in the caller function.

Package Linux Kernel

Published 2025-09-23

Last modified 2026-01-08

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 6.12.63, 6.14 and later are affected. Fixed in 6.12.64, 6.16.8, 6.17 and their respective stable series.

Affected from

≥ 6.12.63 ≥ 6.14

Fixed in

✓ 6.12.64 6.12.x ✓ 6.16.8 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39872 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/68a6729afd3e8e9a2a32538642ce92b96ccf9b1d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/847748fc66d08a89135a74e29362a66ba4e3ab15
Patch
Kernel patch commit
https://git.kernel.org/stable/c/9433ba79c2ec3ec7c9a711748701549339c3438c
Patch

Details

CVE ID CVE-2025-39872

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-09-23

Modified 2026-01-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39872?

CVE-2025-39872 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.12.63 onward and has been patched in 6.12.64, 6.16.8 and 6.17. CVE-2025-39872 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39872?

CVE-2025-39872 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-2025-39872?

Yes — CVE-2025-39872 has been patched. Fixed versions include 6.12.64, 6.16.8 and 6.17. If you are running Linux kernel 6.12.63 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39872 actively exploited?

No — CVE-2025-39872 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.