MediumCVE-2026-46018

    Linux Kernel: security vulnerability (CVE-2026-46018)

    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: ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES parse_uac2_sample_rate_range() caps the number of enumerated rates at MAX_NR_RATES, but it only breaks out of the current rate loop. A malformed UAC2 RANGE response with additional triplets continues parsing the remaining triplets and repeatedly prints "invalid uac2 rates" while probe still holds register_mutex.

    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: NVD, 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

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 7.7

    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
    45.99 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
    0.2 %
    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
    7.7
    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: ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES parse_uac2_sample_rate_range() caps the number of enumerated rates at MAX_NR_RATES, but it only breaks out of the current rate loop. A malformed UAC2 RANGE response with additional triplets continues parsing the remaining triplets and repeatedly prints "invalid uac2 rates" while probe still holds register_mutex. Stop the whole parse once the cap is reached and return the number of rates collected so far.

    Source: suse_csaf, Debian LTS Advisories, Ubuntu Security Notices, siemens_advisory, BSI WID Portal, BSI CSAF, NVD (NIST), CVE.org (MITRE), cvelistv5, Microsoft Security Update Guide, 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
    • 6.19 – < 7.0.4
    • 6.2 – < 6.6.140
    • 6.13 – < 6.18.27
    • 3.2.47 – < 3.3
    • 5.11 – < 5.15.209
    • —
    • 3.3 – < 5.10.258
    • 6.7 – < 6.12.86
    • 3.0.81 – < 3.1
    • 6.1.175
    • 7.0.4
    • 6.6.140
    • 6.18.27
    • 3.3
    • 5.15.209
    • 7.1
    • 5.10.258
    • 6.12.86
    • 3.1
    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
    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/0da05fedf5e1966b7e7d389866cb86fcf09f4b32
      Referenceadded
      —
      https://git.kernel.org/stable/c/3c318f97dcc50b2e0556a1813bd6958678e881fd
      Referenceadded
      —
      https://git.kernel.org/stable/c/4d7893a137eadb6163ea4298bf67d74b811d76ef
      Referenceadded
      —
      https://git.kernel.org/stable/c/5436bc1b07d4656f99412dc72871d250d7d55205
      Referenceadded
      —
      https://git.kernel.org/stable/c/a0b78639ef09b2e77974a3de3b1c07f6de3c5e56
      Referenceadded
      —
      https://git.kernel.org/stable/c/ab5ba9fd138758ddc50222264ff246b31e397abf
      Referenceadded
      —
      https://git.kernel.org/stable/c/ba036305323814ec1f8655313b2fa6a0f7048716
      Referenceadded
      —
      https://git.kernel.org/stable/c/f14bd323eec4b4f0ef662520ec852e593ece1d4c
      Referenceremoved
      https://git.kernel.org/stable/c/0da05fedf5e1966b7e7d389866cb86fcf09f4b32
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3c318f97dcc50b2e0556a1813bd6958678e881fd
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4d7893a137eadb6163ea4298bf67d74b811d76ef
      —
      Referenceremoved
      https://git.kernel.org/stable/c/5436bc1b07d4656f99412dc72871d250d7d55205
      —
      Referenceremoved
      https://git.kernel.org/stable/c/a0b78639ef09b2e77974a3de3b1c07f6de3c5e56
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ab5ba9fd138758ddc50222264ff246b31e397abf
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ba036305323814ec1f8655313b2fa6a0f7048716
      —
      Referenceremoved
      https://git.kernel.org/stable/c/f14bd323eec4b4f0ef662520ec852e593ece1d4c
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/0da05fedf5e1966b7e7d389866cb86fcf09f4b32 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3c318f97dcc50b2e0556a1813bd6958678e881fd Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4d7893a137eadb6163ea4298bf67d74b811d76ef Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/5436bc1b07d4656f99412dc72871d250d7d55205 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/a0b78639ef09b2e77974a3de3b1c07f6de3c5e56 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ab5ba9fd138758ddc50222264ff246b31e397abf Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ba036305323814ec1f8655313b2fa6a0f7048716 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/f14bd323eec4b4f0ef662520ec852e593ece1d4c 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-2026-46018.json">CVE-2026-46018</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 (6.7 – before 6.12.86; 5.16 – before 6.1.175; 5.11 – before 5.15.209; 6.2 – before 6.6.140; 6.13 – before 6.18.27; 6.19 – before 7.0.4; 3.0.81 – before 3.1; 3.2.47 – before 5.10.258)

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

      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
      —
      NVD-CWE-noinfo
      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) 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) 6.2 up to (excluding) 6.6.140 *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) 3.0.81 up to (excluding) 3.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.2.47 up to (excluding) 5.10.258
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/0da05fedf5e1966b7e7d389866cb86fcf09f4b32 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/3c318f97dcc50b2e0556a1813bd6958678e881fd Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4d7893a137eadb6163ea4298bf67d74b811d76ef Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/5436bc1b07d4656f99412dc72871d250d7d55205 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/a0b78639ef09b2e77974a3de3b1c07f6de3c5e56 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/ab5ba9fd138758ddc50222264ff246b31e397abf Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/ba036305323814ec1f8655313b2fa6a0f7048716 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/f14bd323eec4b4f0ef662520ec852e593ece1d4c Types: Patch

      Source identifier: nvd@nist.gov

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