MediumCVE-2026-23141

    Linux Kernel: security vulnerability (CVE-2026-23141)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: btrfs: send: check for inline extents in range_is_hole_in_parent() Before accessing the disk_bytenr field of a file extent item we need to check if we are dealing with an inline extent. This is because for inline extents their data starts at the offset of the disk_bytenr field.

    Update Linux Kernel to version 5.15.209, Linux Kernel to version 6.1.167, Linux Kernel to version 6.6.122.

    Affected
    • Linux Kernel lt 4.11..5.15.209
    • Linux Kernel lt 5.16..6.1.167
    • Linux Kernel lt 6.2..6.6.122
    • Linux Kernel lt 6.7..6.12.67
    • Linux Kernel lt 6.13..6.18.7
    Fixed in
    • Linux Kernel 5.15.209
    • Linux Kernel 6.1.167
    • Linux Kernel 6.6.122
    • Linux Kernel 6.12.67
    • Linux Kernel 6.18.7
    • Linux Kernel 6.19

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 3.7

    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
    41.93 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
    0.1 %
    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
    3.7
    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: btrfs: send: check for inline extents in range_is_hole_in_parent() Before accessing the disk_bytenr field of a file extent item we need to check if we are dealing with an inline extent. This is because for inline extents their data starts at the offset of the disk_bytenr field. So accessing the disk_bytenr means we are accessing inline data or in case the inline data is less than 8 bytes we can actually cause an invalid memory access if this inline extent item is the first item in the leaf or access metadata from other items.

    Source: Ubuntu Security Notices, Debian Security Advisories, Debian LTS Advisories, suse_csaf, siemens_advisory, BSI WID Portal, BSI CSAF, ENISA EUVD, cvelistv5, NVD (NIST), Microsoft Security Update Guide, 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
    • 6.2 – < 6.6.122
    • —
    • 6.7 – < 6.12.67
    • 4.11 – < 5.15.209
    • 6.13 – < 6.18.7
    • 5.16 – < 6.1.167
    • 6.6.122
    • 6.19
    • 6.12.67
    • 5.15.209
    • 6.18.7
    • 6.1.167
    IBMQRadar SIEM
    • <7.5.0 UP15 IF02
    • —
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinux-6.1bullseye
    Linuxlinuxlinux_kernel6.19
    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/2026/23xxx/CVE-2026-23141.json">CVE-2026-23141</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    2. Record modifiedLinux

      Show 16 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/08b096c1372cd69627f4f559fb47c9fb67a52b39
      Referenceadded
      —
      https://git.kernel.org/stable/c/39f83f10772310ba4a77f2b5256aaf36994ef7e8
      Referenceadded
      —
      https://git.kernel.org/stable/c/901e581bfc44d181f7d9c3f11880dac3e89deb2e
      Referenceadded
      —
      https://git.kernel.org/stable/c/d948055bd46a9c14d1d4217aed65c5c258c32903
      Referenceadded
      —
      https://git.kernel.org/stable/c/db00636643e66898d79f2530ac9c56ebd5eca369
      Referenceadded
      —
      https://git.kernel.org/stable/c/f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9
      Referenceremoved
      https://git.kernel.org/stable/c/08b096c1372cd69627f4f559fb47c9fb67a52b39
      —
      Referenceremoved
      https://git.kernel.org/stable/c/39f83f10772310ba4a77f2b5256aaf36994ef7e8
      —
      Referenceremoved
      https://git.kernel.org/stable/c/901e581bfc44d181f7d9c3f11880dac3e89deb2e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d948055bd46a9c14d1d4217aed65c5c258c32903
      —
      Referenceremoved
      https://git.kernel.org/stable/c/db00636643e66898d79f2530ac9c56ebd5eca369
      —
      Referenceremoved
      https://git.kernel.org/stable/c/f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/08b096c1372cd69627f4f559fb47c9fb67a52b39 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/39f83f10772310ba4a77f2b5256aaf36994ef7e8 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/db00636643e66898d79f2530ac9c56ebd5eca369 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9 Types: Patch
      —

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

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