CVE-2025-21814: linux kernel Null Dereference — Fix

Description

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.

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.0 — 6.1.129
linux	linux_kernel	6.2 — 6.6.78
linux	linux_kernel	6.7 — 6.12.14
linux	linux_kernel	6.13 — 6.13.3

References

Advisories & Patches

https://git.kernel.org/stable/c/5d1041c76de656f9f8d5a192218039a9acf9bd00 https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3 https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339 https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002 https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b

Other References

https://git.kernel.org/stable/c/1334c64a5d1de6666e0c9f984db6745083df1eb4 https://git.kernel.org/stable/c/9df3a9284f39bfd51a9f72a6a165c79e2aa5066b https://git.kernel.org/stable/c/fdc1e72487781dd7705bcbe30878bee7d5d1f3e8 https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Frequently Asked Questions

What is CVE-2025-21814? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21814? +

CVE-2025-21814 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21814? +

CVE-2025-21814 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21814? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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