MediumCVE-2026-46038

    Linux Kernel: security vulnerability (CVE-2026-46038)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Free the node during ctrl_cmd_bye() A node sends the BYE packet when it is about to go down. So the nameserver should advertise the removal of the node to all remote and local observers and free the node finally.

    Update Linux Kernel to version 5.10.259, Linux Kernel to version 5.15.210, Linux Kernel to version 6.1.176.

    Affected
    • Linux Kernel lt 5.7..5.10.259
    • Linux Kernel lt 5.11..5.15.210
    • Linux Kernel lt 5.16..6.1.176
    • Linux Kernel lt 6.2..6.6.140
    • Linux Kernel lt 6.7..6.12.86
    • Linux Kernel lt 6.13..6.18.27
    • Linux Kernel lt 6.19..7.0.4
    Fixed in
    • Linux Kernel 5.10.259
    • Linux Kernel 5.15.210
    • Linux Kernel 6.1.176
    • Linux Kernel 6.6.140
    • Linux Kernel 6.12.86
    • Linux Kernel 6.18.27
    • Linux Kernel 7.0.4
    • Linux Kernel 7.1

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.5

    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
    45.56 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
    0.1 %
    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
    2.5
    Low — this CVE sits in the lower 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: net: qrtr: ns: Free the node during ctrl_cmd_bye() A node sends the BYE packet when it is about to go down. So the nameserver should advertise the removal of the node to all remote and local observers and free the node finally. But currently, the nameserver doesn't free the node memory even after processing the BYE packet. This causes the node memory to leak. Hence, remove the node from Xarray list and free the node memory during both success and failure case of ctrl_cmd_bye().

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

    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
    • 6.19 – < 7.0.4
    • 6.2 – < 6.6.140
    • 5.11 – < 5.15.210
    • 5.7 – < 5.10.259
    • 6.13 – < 6.18.27
    • —
    • 5.16 – < 6.1.176
    • 6.7 – < 6.12.86
    • 7.0.4
    • 6.6.140
    • 5.15.210
    • 5.10.259
    • 6.18.27
    • 7.1
    • 6.1.176
    • 6.12.86
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxbullseye
    Linuxdebianlinux-6.1bullseye
    Linuxubuntulinux-gcp-5.15focal
    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/076e4b162d6caba12c229e7f262df5b6881162b0
      Referenceadded
      —
      https://git.kernel.org/stable/c/154fc7fe3f62c46891c3c4302f4b5b5391c932e6
      Referenceadded
      —
      https://git.kernel.org/stable/c/25d580a46b079a7963ff024a5195e547baf12b64
      Referenceadded
      —
      https://git.kernel.org/stable/c/65932f5102bb5377db36c8a4f0c28179a1967a9a
      Referenceadded
      —
      https://git.kernel.org/stable/c/68efba36446a7774ea5b971257ade049272a07ac
      Referenceadded
      —
      https://git.kernel.org/stable/c/6c9cca46acb6f22e63f015ea7b2ed6032d2badf5
      Referenceadded
      —
      https://git.kernel.org/stable/c/a5a454f3364877b22f0e5a165df8b3702ff96ae7
      Referenceadded
      —
      https://git.kernel.org/stable/c/ff78ed177a66763085e3214d6fbe13ca8f0b3f11
      Referenceremoved
      https://git.kernel.org/stable/c/076e4b162d6caba12c229e7f262df5b6881162b0
      —
      Referenceremoved
      https://git.kernel.org/stable/c/154fc7fe3f62c46891c3c4302f4b5b5391c932e6
      —
      Referenceremoved
      https://git.kernel.org/stable/c/25d580a46b079a7963ff024a5195e547baf12b64
      —
      Referenceremoved
      https://git.kernel.org/stable/c/65932f5102bb5377db36c8a4f0c28179a1967a9a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/68efba36446a7774ea5b971257ade049272a07ac
      —
      Referenceremoved
      https://git.kernel.org/stable/c/6c9cca46acb6f22e63f015ea7b2ed6032d2badf5
      —
      Referenceremoved
      https://git.kernel.org/stable/c/a5a454f3364877b22f0e5a165df8b3702ff96ae7
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ff78ed177a66763085e3214d6fbe13ca8f0b3f11
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/076e4b162d6caba12c229e7f262df5b6881162b0 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/154fc7fe3f62c46891c3c4302f4b5b5391c932e6 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/65932f5102bb5377db36c8a4f0c28179a1967a9a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/68efba36446a7774ea5b971257ade049272a07ac Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ff78ed177a66763085e3214d6fbe13ca8f0b3f11 Types: Patch
      —

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

    2. Record modifiedSiemens ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/46xxx/CVE-2026-46038.json">CVE-2026-46038</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    3. Record modifiedLinux

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/25d580a46b079a7963ff024a5195e547baf12b64
      Referenceadded
      —
      https://git.kernel.org/stable/c/6c9cca46acb6f22e63f015ea7b2ed6032d2badf5
      Referenceadded
      —
      https://git.kernel.org/stable/c/a5a454f3364877b22f0e5a165df8b3702ff96ae7
      Affected versions (publisher)changed
      Linux, Linux
      Linux, Linux

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (6.7 – before 6.12.86; 6.13 – before 6.18.27; 6.19 – before 7.0.4; 5.7 – before 6.6.140)

      CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-401

      Show 8 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-401
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.86 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.27 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.7 up to (excluding) 6.6.140
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/076e4b162d6caba12c229e7f262df5b6881162b0 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/154fc7fe3f62c46891c3c4302f4b5b5391c932e6 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/65932f5102bb5377db36c8a4f0c28179a1967a9a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/68efba36446a7774ea5b971257ade049272a07ac Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/ff78ed177a66763085e3214d6fbe13ca8f0b3f11 Types: Patch

      Source identifier: nvd@nist.gov

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