MediumCVE-2024-26855

    Linux Kernel: NULL Pointer Dereference (CVE-2024-26855)

    Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, Red Hat, BSI, EUVD, CVE.org

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: net: ice: Fix potential NULL pointer dereference in ice_bridge_setlink() The function ice_bridge_setlink() may encounter a NULL pointer dereference if nlmsg_find_attr() returns NULL and br_spec is dereferenced subsequently in nla_for_each_nested(). To address this issue, add a check to ensure that br_spec is not NULL before proceeding with the nested attribute iteration.

    Update Linux Kernel to version 5.4.272, Linux Kernel to version 5.10.213, Linux Kernel to version 5.15.152.

    Affected
    • Linux Kernel lt 4.20..5.4.272
    • Linux Kernel lt 5.5..5.10.213
    • Linux Kernel lt 5.11..5.15.152
    • Linux Kernel lt 5.16..6.1.82
    • Linux Kernel lt 6.2..6.6.22
    • Linux Kernel lt 6.7..6.7.10
    Fixed in
    • Linux Kernel 5.4.272
    • Linux Kernel 5.10.213
    • Linux Kernel 5.15.152
    • Linux Kernel 6.1.82
    • Linux Kernel 6.6.22
    • Linux Kernel 6.7.10
    • Linux Kernel 6.8

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    5.5

    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: Siemens ProductCERT, SUSE, Debian, Red Hat, BSI, EUVD, CVE.org

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 16.5

    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
    34.53 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
    0.3 %
    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
    16.5
    Elevated — this CVE ranks above at least 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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 23 April 2024

    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: net: ice: Fix potential NULL pointer dereference in ice_bridge_setlink() The function ice_bridge_setlink() may encounter a NULL pointer dereference if nlmsg_find_attr() returns NULL and br_spec is dereferenced subsequently in nla_for_each_nested(). To address this issue, add a check to ensure that br_spec is not NULL before proceeding with the nested attribute iteration.

    Source: siemens_advisory, suse_csaf, Debian Security Advisories, redhat_csaf, BSI CSAF, BSI WID Portal, ENISA EUVD, cvelistv5, NVD (NIST)

    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
    • 5.11 – < 5.15.152
    • 6.2 – < 6.6.22
    • —
    • 4.20 – < 5.4.272
    • 6.7 – < 6.7.10
    • 5.16 – < 6.1.82
    • 5.5 – < 5.10.213
    • 5.15.152
    • 6.6.22
    • 6.8
    • 5.4.272
    • 6.7.10
    • 6.1.82
    • 5.10.213

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebiandebian_linux10.0
    Linuxdebianlinuxbullseye
    Linuxlinuxlinux_kernel6.8
    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
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      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c
      Referenceadded
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      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f
      Referenceadded
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      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3
      Referenceadded
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      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309
      Referenceadded
      —
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19
      Referenceadded
      —
      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596
      Referenceadded
      —
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb
      Referenceremoved
      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f
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      Referenceremoved
      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3
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      Referenceremoved
      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309
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      Referenceremoved
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19
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      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596
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      Referenceremoved
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb Types: Patch
      —

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

    2. Record modifiedCVE Program

      Show 24 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c
      Referenceadded
      —
      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f
      Referenceadded
      —
      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3
      Referenceadded
      —
      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309
      Referenceadded
      —
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19
      Referenceadded
      —
      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596
      Referenceadded
      —
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
      Referenceremoved
      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f
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      Referenceremoved
      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3
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      Referenceremoved
      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19
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      Referenceremoved
      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/06e456a05d669ca30b224b8ed962421770c1496c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/0e296067ae0d74a10b4933601f9aa9f0ec8f157f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1a770927dc1d642b22417c3e668c871689fc58b3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/37fe99016b12d32100ce670216816dba6c48b309 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8d95465d9a424200485792858c5b3be54658ce19 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/afdd29726a6de4ba27cd15590661424c888dc596 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d9fefc51133107e59d192d773be86c1150cfeebb Types: Patch
      —
      Reference typeremoved
      https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Types: Mailing List
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/26xxx/CVE-2024-26855.json">CVE-2024-26855</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      Referenceremoved
      https://cert-portal.siemens.com/productcert/html/ssa-265688.html
      —

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

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