What is CVE-2025-39926?

CVE-2025-39926 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.9 onward and patched in 6.12.48, 6.16.8 and 6.17. CVE-2025-39926 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39926?

CVE-2025-39926 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-2025-39926?

Yes, CVE-2025-39926 has been patched. Fixed versions include 6.12.48, 6.16.8 and 6.17. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39926 actively exploited?

CVE-2025-39926 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39926

Medium

In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners. However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space. Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.

Package Linux Kernel

Published 2025-10-01

Last modified 2026-01-14

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 6.9 and later are affected. Fixed in 6.12.48, 6.16.8, 6.17 and their respective stable series.

Affected from

≥ 6.9

Fixed in

✓ 6.12.48 6.12.x ✓ 6.16.8 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39926 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/1dbfb0363224f6da56f6655d596dc5097308d6f5
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207
Patch
Kernel patch commit
https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54
Patch

Details

CVE ID CVE-2025-39926

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-01

Modified 2026-01-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39926?

CVE-2025-39926 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.9 onward and has been patched in 6.12.48, 6.16.8 and 6.17. CVE-2025-39926 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39926?

CVE-2025-39926 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-2025-39926?

Yes — CVE-2025-39926 has been patched. Fixed versions include 6.12.48, 6.16.8 and 6.17. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39926 actively exploited?

No — CVE-2025-39926 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.