HighCVE-2026-46146

    Linux Kernel: security vulnerability (CVE-2026-46146)

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

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3() The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor. Add a proper size check to abort the loop for plugging the hole.

    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

    7.1

    Priority

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

    Source: Vendor (CNA), CVSS v3

    5.5

    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 2.7

    Show all metrics
    Severity
    High
    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
    45.39 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
    7.1 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
    2.7
    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
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    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: ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3() The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor. Add a proper size check to abort the loop for plugging the hole.

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

    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
    • 6.17 – < 6.18.30
    • 5.4.297 – < 5.5
    • 5.10.241 – < 5.10.258
    • 6.12.43 – < 6.12.88
    • 5.15.190 – < 5.15.209
    • 6.19 – < 7.0.7
    • 6.16.2 – < 6.17
    • —
    • 6.15.11 – < 6.16
    • 6.1.149 – < 6.1.175
    • 6.6.103 – < 6.6.140
    • 6.18.30
    • 5.5
    • 5.10.258
    • 6.12.88
    • 5.15.209
    • 7.0.7
    • 6.17
    • 7.1
    • 6.16
    • 6.1.175
    • 6.6.140
    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_kernel6.17
    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 modifiedLinux

      Show 24 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/076d5d13eb9c1ad259a7f246149f6676c62285f9
      Referenceadded
      —
      https://git.kernel.org/stable/c/24a40df79307ca7ca0eec0889361cf6ac146d72a
      Referenceadded
      —
      https://git.kernel.org/stable/c/316aa0b1e3c5600eae5ab876394c1ac70e6db581
      Referenceadded
      —
      https://git.kernel.org/stable/c/4e0ee232ebe3df04874125d7c7f3e6c25ea5483d
      Referenceadded
      —
      https://git.kernel.org/stable/c/6e7247d8f5fefeceb0bb9cc80a5388a636b219cd
      Referenceadded
      —
      https://git.kernel.org/stable/c/be09b47ed8677d76962e3240c145502e2ad9f3c8
      Referenceadded
      —
      https://git.kernel.org/stable/c/e0e3dcf48189603f3865f1a0b799b3b42baae96d
      Referenceadded
      —
      https://git.kernel.org/stable/c/fa5b19ce69067874b1413f3c2027563bae8c2cb3
      Referenceremoved
      https://git.kernel.org/stable/c/076d5d13eb9c1ad259a7f246149f6676c62285f9
      —
      Referenceremoved
      https://git.kernel.org/stable/c/24a40df79307ca7ca0eec0889361cf6ac146d72a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/316aa0b1e3c5600eae5ab876394c1ac70e6db581
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4e0ee232ebe3df04874125d7c7f3e6c25ea5483d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/6e7247d8f5fefeceb0bb9cc80a5388a636b219cd
      —
      Referenceremoved
      https://git.kernel.org/stable/c/be09b47ed8677d76962e3240c145502e2ad9f3c8
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e0e3dcf48189603f3865f1a0b799b3b42baae96d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fa5b19ce69067874b1413f3c2027563bae8c2cb3
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/076d5d13eb9c1ad259a7f246149f6676c62285f9 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/24a40df79307ca7ca0eec0889361cf6ac146d72a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/316aa0b1e3c5600eae5ab876394c1ac70e6db581 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4e0ee232ebe3df04874125d7c7f3e6c25ea5483d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/6e7247d8f5fefeceb0bb9cc80a5388a636b219cd Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/be09b47ed8677d76962e3240c145502e2ad9f3c8 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e0e3dcf48189603f3865f1a0b799b3b42baae96d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/fa5b19ce69067874b1413f3c2027563bae8c2cb3 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-2026-46146.json">CVE-2026-46146</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    3. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (5.4.297 – before 5.5; 6.15.11 – before 6.16; 6.16.2 – before 6.17; 6.19 – before 7.0.7; 5.10.241 – before 5.10.258; 5.15.190 – before 5.15.209; 6.1.149 – before 6.1.175; 6.12.43 – before 6.12.88; 6.17.1 – before 6.18.30; 6.6.103 – before 6.6.140; 8 individual versions)

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

      Weakness type: CWE-835

      Show 11 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-835
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.297 up to (excluding) 5.5 *cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.15.11 up to (excluding) 6.16 *cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.16.2 up to (excluding) 6.17 *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *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) 5.10.241 up to (excluding) 5.10.258 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15.190 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.149 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.43 up to (excluding) 6.12.88 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.17.1 up to (excluding) 6.18.30 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.103 up to (excluding) 6.6.140
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/076d5d13eb9c1ad259a7f246149f6676c62285f9 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/24a40df79307ca7ca0eec0889361cf6ac146d72a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/316aa0b1e3c5600eae5ab876394c1ac70e6db581 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4e0ee232ebe3df04874125d7c7f3e6c25ea5483d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/6e7247d8f5fefeceb0bb9cc80a5388a636b219cd Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/be09b47ed8677d76962e3240c145502e2ad9f3c8 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/e0e3dcf48189603f3865f1a0b799b3b42baae96d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/fa5b19ce69067874b1413f3c2027563bae8c2cb3 Types: Patch

      Source identifier: nvd@nist.gov

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