MediumCVE-2025-21814

    Linux Kernel: security vulnerability (CVE-2025-21814)

    Published Last modified Sources: Siemens ProductCERT, Debian LTS, SUSE, BSI, CVE.org, EUVD, Msrc Update Guide

    What is affected, what to do

    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.

    Update Linux Kernel to version 5.4.291, Linux Kernel to version 5.10.235, Linux Kernel to version 5.15.179.

    Affected
    • Linux Kernel lt 3.0..5.4.291
    • Linux Kernel lt 5.5..5.10.235
    • Linux Kernel lt 5.11..5.15.179
    • Linux Kernel lt 5.16..6.1.129
    • Linux Kernel lt 6.2..6.6.78
    • Linux Kernel lt 6.7..6.12.14
    • Linux Kernel lt 6.13..6.13.3
    Fixed in
    • Linux Kernel 5.4.291
    • Linux Kernel 5.10.235
    • Linux Kernel 5.15.179
    • Linux Kernel 6.1.129
    • Linux Kernel 6.6.78
    • Linux Kernel 6.12.14
    • Linux Kernel 6.13.3
    • Linux Kernel 6.14

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    5.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Siemens ProductCERT, Debian LTS, SUSE, BSI, CVE.org, EUVD, Msrc Update Guide

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 18.2

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    38.14 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    5.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.3 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    18.2
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    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.

    Source: siemens_advisory, Debian LTS Advisories, suse_csaf, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), CVE.org (MITRE), ENISA EUVD, Microsoft Security Update Guide

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    LinuxLinux
    • 3.0 – < 5.4.291
    • 5.5 – < 5.10.235
    • —
    • 5.16 – < 6.1.129
    • 5.11 – < 5.15.179
    • 6.7 – < 6.12.14
    • 6.2 – < 6.6.78
    • 6.13 – < 6.13.3
    • 5.4.291
    • 5.10.235
    • 6.14
    • 6.1.129
    • 5.15.179
    • 6.12.14
    • 6.6.78
    • 6.13.3
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbullseye
    Linuxdebianlinux-6.1bullseye
    Linuxlinuxlinux_kernel—

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedLinux

      Show 21 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/1334c64a5d1de6666e0c9f984db6745083df1eb4
      Referenceadded
      —
      https://git.kernel.org/stable/c/5d1041c76de656f9f8d5a192218039a9acf9bd00
      Referenceadded
      —
      https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3
      Referenceadded
      —
      https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339
      Referenceadded
      —
      https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002
      Referenceadded
      —
      https://git.kernel.org/stable/c/9df3a9284f39bfd51a9f72a6a165c79e2aa5066b
      Referenceadded
      —
      https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b
      Referenceadded
      —
      https://git.kernel.org/stable/c/fdc1e72487781dd7705bcbe30878bee7d5d1f3e8
      Referenceremoved
      https://git.kernel.org/stable/c/1334c64a5d1de6666e0c9f984db6745083df1eb4
      —
      Referenceremoved
      https://git.kernel.org/stable/c/5d1041c76de656f9f8d5a192218039a9acf9bd00
      —
      Referenceremoved
      https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9df3a9284f39bfd51a9f72a6a165c79e2aa5066b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fdc1e72487781dd7705bcbe30878bee7d5d1f3e8
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/5d1041c76de656f9f8d5a192218039a9acf9bd00 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b Types: Patch
      —

      Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    2. Record modifiedCVE Program

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 7 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/21xxx/CVE-2025-21814.json">CVE-2025-21814</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-019113.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-457936.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html
      Referenceremoved
      https://cert-portal.siemens.com/productcert/html/ssa-019113.html
      —
      Referenceremoved
      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      —

      Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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