MediumCVE-2026-46187

    Linux Kernel: security vulnerability (CVE-2026-46187)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: wifi: rsi: fix kthread lifetime race between self-exit and external-stop RSI driver use both self-exit(kthread_complete_and_exit) and external-stop (kthread_stop) when killing a kthread. Generally, kthread_stop() is called first, and in this case, no particular issues occur.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Conflicting version data — version display is hidden until the data is resolved.

    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: Vendor (CNA), CVSS v3

    4.7

    CVSS v3

    Severity Medium on the scale from 0 to 10.

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 0.7

    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
    41.56 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
    4.7
    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
    0.7
    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: wifi: rsi: fix kthread lifetime race between self-exit and external-stop RSI driver use both self-exit(kthread_complete_and_exit) and external-stop (kthread_stop) when killing a kthread. Generally, kthread_stop() is called first, and in this case, no particular issues occur. However, in rare instances where kthread_complete_and_exit() is called first and then kthread_stop() is called, a UAF occurs because the kthread object, which has already exited and been freed, is accessed again. Therefore, to prevent this with minimal modification, you must remove kthread_stop() and change the code to wait until the self-exit operation is completed.

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

    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
    • 5.16 – < 6.1.175
    • 4.19.36 – < 4.20
    • 6.7 – < 6.12.88
    • 4.4.179 – < 4.5
    • 4.14.113 – < 4.15
    • 6.2 – < 6.6.140
    • 6.19 – < 7.0.7
    • 5.11 – < 5.15.209
    • 4.20 – < 5.10.258
    • 4.9.170 – < 4.10
    • —
    • 3.18.139 – < 3.19
    • 6.13 – < 6.18.30
    • 6.1.175
    • 4.20
    • 6.12.88
    • 4.5
    • 4.15
    • 6.6.140
    • 7.0.7
    • 5.15.209
    • 5.10.258
    • 4.10
    • 7.1
    • 3.19
    • 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_kernel7.1
    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 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-2026-46187.json">CVE-2026-46187</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    2. Record modifiedLinux

      Show 24 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/16d9f674c619838bdeae42abc0929c9c5477ea1f
      Referenceadded
      —
      https://git.kernel.org/stable/c/4ac3095da22fc50e51ec10c3b8323c21ab3e441a
      Referenceadded
      —
      https://git.kernel.org/stable/c/4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f
      Referenceadded
      —
      https://git.kernel.org/stable/c/4f697813162d5f9151726a6d2bee82bffe4b0256
      Referenceadded
      —
      https://git.kernel.org/stable/c/4f9a4ae8d2c198f01611ea376034c326ef43ab56
      Referenceadded
      —
      https://git.kernel.org/stable/c/95fcb436586dc3c2983537d557ac05bbc6a027f3
      Referenceadded
      —
      https://git.kernel.org/stable/c/9dfe8a4458a063c6433526bc59112a169eee1aa3
      Referenceadded
      —
      https://git.kernel.org/stable/c/db57a1aa54ff68669781976e4edb045e09e2b65b
      Referenceremoved
      https://git.kernel.org/stable/c/16d9f674c619838bdeae42abc0929c9c5477ea1f
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4ac3095da22fc50e51ec10c3b8323c21ab3e441a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4f697813162d5f9151726a6d2bee82bffe4b0256
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4f9a4ae8d2c198f01611ea376034c326ef43ab56
      —
      Referenceremoved
      https://git.kernel.org/stable/c/95fcb436586dc3c2983537d557ac05bbc6a027f3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9dfe8a4458a063c6433526bc59112a169eee1aa3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/db57a1aa54ff68669781976e4edb045e09e2b65b
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/16d9f674c619838bdeae42abc0929c9c5477ea1f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4ac3095da22fc50e51ec10c3b8323c21ab3e441a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4f697813162d5f9151726a6d2bee82bffe4b0256 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4f9a4ae8d2c198f01611ea376034c326ef43ab56 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/95fcb436586dc3c2983537d557ac05bbc6a027f3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/9dfe8a4458a063c6433526bc59112a169eee1aa3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/db57a1aa54ff68669781976e4edb045e09e2b65b Types: Patch
      —

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

    3. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (3.18.139 – before 3.19; 4.4.179 – before 4.5; 6.13 – before 6.18.30; 5.16 – before 6.1.175; 5.11 – before 5.15.209; 6.19 – before 7.0.7; 6.7 – before 6.12.88; 6.2 – before 6.6.140; 4.14.113 – before 4.15; 4.19.36 – before 5.10.258; 4.9.170 – before 4.10; 2 individual versions)

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

      Weakness type: CWE-362

      Show 11 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-362
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.18.139 up to (excluding) 3.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.4.179 up to (excluding) 4.5 *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *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) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *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) 6.2 up to (excluding) 6.6.140 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14.113 up to (excluding) 4.15 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19.36 up to (excluding) 5.10.258 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.9.170 up to (excluding) 4.10
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/16d9f674c619838bdeae42abc0929c9c5477ea1f Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4ac3095da22fc50e51ec10c3b8323c21ab3e441a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4f697813162d5f9151726a6d2bee82bffe4b0256 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4f9a4ae8d2c198f01611ea376034c326ef43ab56 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/95fcb436586dc3c2983537d557ac05bbc6a027f3 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/9dfe8a4458a063c6433526bc59112a169eee1aa3 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/db57a1aa54ff68669781976e4edb045e09e2b65b Types: Patch

      Source identifier: nvd@nist.gov

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