HighCVE-2026-46177

    Linux Kernel: security vulnerability (CVE-2026-46177)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: ipmi: Add limits to event and receive message requests The driver would just fetch events and receive messages until the BMC said it was done. To avoid issues with BMCs that never say they are done, add a limit of 10 fetches at a time.

    Update Linux Kernel to version 5.10.258, Linux Kernel to version 5.15.209, Linux Kernel to version 6.1.175.

    Affected
    • Linux Kernel lt 2.6.12..5.10.258
    • Linux Kernel lt 5.11..5.15.209
    • Linux Kernel lt 5.16..6.1.175
    • 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 5.10.258
    • Linux Kernel 5.15.209
    • Linux Kernel 6.1.175
    • 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

    7.5

    Priority

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

    Source: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

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

    0.6 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 46.9

    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
    73.00 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
    7.5 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
    7.5
    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
    0.6 %
    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
    46.9
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    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: ipmi: Add limits to event and receive message requests The driver would just fetch events and receive messages until the BMC said it was done. To avoid issues with BMCs that never say they are done, add a limit of 10 fetches at a time. In addition, an si interface has an attn state it can return from the hardware which is supposed to cause a flag fetch to see if the driver needs to fetch events or message or a few other things. If the attn bit gets stuck, it's a similar problem. So allow messages in between flag fetches so the driver itself doesn't get stuck. This is a more general fix than the previous fix for the specific bad BMC, but should fix the more general issue of a BMC that won't stop saying it has data. This has been there from the beginning of the driver. It's not a bug per-se, but it is accounting for bugs in BMCs.

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

    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
    • 6.7 – < 6.12.88
    • 6.2 – < 6.6.140
    • 6.19 – < 7.0.7
    • 5.11 – < 5.15.209
    • 2.6.12 – < 5.10.258
    • —
    • 6.13 – < 6.18.30
    • 6.1.175
    • 6.12.88
    • 6.6.140
    • 7.0.7
    • 5.15.209
    • 5.10.258
    • 7.1
    • 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_kernel2.6.12
    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/112df8e631636cafda64dcee4561daf09ce74a4a
      Referenceadded
      —
      https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471
      Referenceadded
      —
      https://git.kernel.org/stable/c/3d37d2165df9504ea99d9e6181552dc4d2d1ab37
      Referenceadded
      —
      https://git.kernel.org/stable/c/67c44e0deba936d5edaebea356b4589eb43acb5c
      Referenceadded
      —
      https://git.kernel.org/stable/c/9059dc94421e1d4f8e5844204608b37ebfddb3da
      Referenceadded
      —
      https://git.kernel.org/stable/c/c024167fb00489baee08c72182ca2e7dc5fb9f20
      Referenceadded
      —
      https://git.kernel.org/stable/c/c4cca236968683eb0d59abfb12d5c7e4d8514227
      Referenceadded
      —
      https://git.kernel.org/stable/c/e20212b431bef217d3886b86bbc90cc3ed00de68
      Referenceremoved
      https://git.kernel.org/stable/c/112df8e631636cafda64dcee4561daf09ce74a4a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3d37d2165df9504ea99d9e6181552dc4d2d1ab37
      —
      Referenceremoved
      https://git.kernel.org/stable/c/67c44e0deba936d5edaebea356b4589eb43acb5c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9059dc94421e1d4f8e5844204608b37ebfddb3da
      —
      Referenceremoved
      https://git.kernel.org/stable/c/c024167fb00489baee08c72182ca2e7dc5fb9f20
      —
      Referenceremoved
      https://git.kernel.org/stable/c/c4cca236968683eb0d59abfb12d5c7e4d8514227
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e20212b431bef217d3886b86bbc90cc3ed00de68
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/112df8e631636cafda64dcee4561daf09ce74a4a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3d37d2165df9504ea99d9e6181552dc4d2d1ab37 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/67c44e0deba936d5edaebea356b4589eb43acb5c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/9059dc94421e1d4f8e5844204608b37ebfddb3da Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c024167fb00489baee08c72182ca2e7dc5fb9f20 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c4cca236968683eb0d59abfb12d5c7e4d8514227 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e20212b431bef217d3886b86bbc90cc3ed00de68 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-2026-46177.json">CVE-2026-46177</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 (6.13 – 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; 2.6.12.1 – before 5.10.258; 7 individual versions)
      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      NVD-CWE-noinfo
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* *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) 2.6.12.1 up to (excluding) 5.10.258
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/112df8e631636cafda64dcee4561daf09ce74a4a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/3d37d2165df9504ea99d9e6181552dc4d2d1ab37 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/67c44e0deba936d5edaebea356b4589eb43acb5c Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/9059dc94421e1d4f8e5844204608b37ebfddb3da Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/c024167fb00489baee08c72182ca2e7dc5fb9f20 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/c4cca236968683eb0d59abfb12d5c7e4d8514227 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/e20212b431bef217d3886b86bbc90cc3ed00de68 Types: Patch

      Source identifier: nvd@nist.gov

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