MediumCVE-2026-46196

    Linux Kernel: security vulnerability (CVE-2026-46196)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func() invokes the subsystem's ext->regfunc() before attempting to install the new probe via func_add(). If func_add() then fails (for example, when allocate_probes() cannot allocate a new probe array under memory pressure and returns -ENOMEM), the function returns the error without calling the matching ext->unregfunc(), leaving the side effects of regfunc() behind with no installed probe to justify them.

    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 4.10..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..6.12.88
    • Linux Kernel lt 6.13..6.18.30
    • Linux Kernel lt 6.19..7.0.7
    Fixed in
    • Linux Kernel 5.10.259
    • Linux Kernel 5.15.210
    • Linux Kernel 6.1.176
    • Linux Kernel 6.6.140
    • Linux Kernel 6.12.88
    • Linux Kernel 6.18.30
    • Linux Kernel 7.0.7
    • 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: Debian LTS, Ubuntu, Siemens ProductCERT, SUSE, BSI, CVE.org, EUVD, Msrc Update Guide

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.9

    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
    45.62 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
    2.9
    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: tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func() invokes the subsystem's ext->regfunc() before attempting to install the new probe via func_add(). If func_add() then fails (for example, when allocate_probes() cannot allocate a new probe array under memory pressure and returns -ENOMEM), the function returns the error without calling the matching ext->unregfunc(), leaving the side effects of regfunc() behind with no installed probe to justify them. For syscall tracepoints this is particularly unpleasant: syscall_regfunc() bumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task. After a leaked failure, the refcount is stuck at a non-zero value with no consumer, and every task continues paying the syscall trace entry/exit overhead until reboot. Other subsystems providing regfunc()/unregfunc() pairs exhibit similarly scoped persistent state. Mirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the func_add() error path, gated on the same condition used there so the unwind is symmetric with the registration.

    Source: Debian LTS Advisories, Ubuntu Security Notices, siemens_advisory, suse_csaf, BSI WID Portal, BSI CSAF, NVD (NIST), CVE.org (MITRE), cvelistv5, 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
    • 6.7 – < 6.12.88
    • 4.10 – < 5.10.259
    • 6.2 – < 6.6.140
    • 5.11 – < 5.15.210
    • 6.19 – < 7.0.7
    • —
    • 5.16 – < 6.1.176
    • 6.13 – < 6.18.30
    • 6.12.88
    • 5.10.259
    • 6.6.140
    • 5.15.210
    • 7.0.7
    • 7.1
    • 6.1.176
    • 6.18.30
    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-oracle-7.0noble
    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/247ed8a969f981bfba3112fd4bb441eaa6cef59c
      Referenceadded
      —
      https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90
      Referenceadded
      —
      https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494
      Referenceadded
      —
      https://git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342
      Referenceadded
      —
      https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251
      Referenceadded
      —
      https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e
      Referenceadded
      —
      https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49
      Referenceadded
      —
      https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e
      Referenceremoved
      https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90
      —
      Referenceremoved
      https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494
      —
      Referenceremoved
      https://git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251
      —
      Referenceremoved
      https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e 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-2026-46196.json">CVE-2026-46196</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/36ff362235307af95152d510b53c2d9b8773a342
      Referenceadded
      —
      https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251
      Referenceadded
      —
      https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e
      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 (6.13 – before 6.18.30; 6.19 – before 7.0.7; 6.7 – before 6.12.88; 4.10 – before 6.6.140)

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

      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
      —
      NVD-CWE-noinfo
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.30 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.7 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.88 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 6.6.140
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e Types: Patch

      Source identifier: nvd@nist.gov

    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-46196
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-46196"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-46196.svg?lang=en" alt="CVE-2026-46196 – NEOSEC Intel" height="20"></a>