What is CVE-2025-21814?

CVE-2025-21814 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 3.0 onward and patched in 5.4.291, 5.10.235, 5.15.179 and others. CVE-2025-21814 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21814?

CVE-2025-21814 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-2025-21814?

Yes, CVE-2025-21814 has been patched. Fixed versions include 5.4.291, 5.10.235, 5.15.179 and others. If you are running Linux kernel 3.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21814 actively exploited?

CVE-2025-21814 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2025-21814

Medium

In the Linux kernel, the following vulnerability has been resolved: ptp: Ensure info->enable callback is always set The ioctl and sysfs handlers unconditionally call the ->enable callback. Not all drivers implement that callback, leading to NULL dereferences. Example of affected drivers: ptp_s390.c, ptp_vclock.c and ptp_mock.c. Instead use a dummy callback if no better was specified by the driver.

Package Linux Kernel

Published 2025-02-27

Last modified 2026-07-14

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

Weakness type

CWE-476

CVE-2025-21814 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.0 and later are affected. Fixed in 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.78, 6.12.14, 6.13.3, 6.14 and their respective stable series.

Affected from

≥ 3.0

Fixed in

✓ 5.4.291 5.4.x ✓ 5.10.235 5.10.x ✓ 5.15.179 5.15.x ✓ 6.1.129 6.1.x ✓ 6.6.78 6.6.x ✓ 6.12.14 6.12.x ✓ 6.13.3 6.13.x ✓ 6.14

References

12 total

Kernel Git
https://git.kernel.org/stable/c/5d1041c76de656f9f8d5a192218039a9acf9bd00

Patch
Kernel Git
https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3

Patch
Kernel Git
https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339

Patch
Kernel Git
https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002

Patch
Kernel Git
https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b

Patch

Showing 5 of 12 references View all on NVD

Details

CVE ID CVE-2025-21814

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-27

Modified 2026-07-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21814?

CVE-2025-21814 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 3.0 onward and has been patched in 5.4.291, 5.10.235, 5.15.179 and others. CVE-2025-21814 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21814?

CVE-2025-21814 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-2025-21814?

Yes. CVE-2025-21814 has been patched. Fixed versions include 5.4.291, 5.10.235, 5.15.179 and others. If you are running Linux kernel 3.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21814 actively exploited?

No. CVE-2025-21814 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.