MediumCVE-2026-23292

    Linux Kernel: security vulnerability (CVE-2026-23292)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix recursive locking in __configfs_open_file() In flush_write_buffer, &p->frag_sem is acquired and then the loaded store function is called, which, here, is target_core_item_dbroot_store(). This function called filp_open(), following which these functions were called (in reverse order), according to the call trace: down_read __configfs_open_file do_dentry_open vfs_open do_open path_openat do_filp_open file_open_name filp_open target_core_item_dbroot_store flush_write_buffer configfs_write_iter target_core_item_dbroot_store() tries to validate the new file path by trying to open the file path provided to it; however, in this case, the bug report shows: db_root: not a directory: /sys/kernel/config/target/dbroot indicating that the same configfs file was tried to be opened, on which it is currently working on.

    Update Linux Kernel to version 4.10, Linux Kernel to version 4.15, Linux Kernel to version 4.20.

    Affected
    • Linux Kernel lt 4.9.201..4.10
    • Linux Kernel lt 4.14.154..4.15
    • Linux Kernel lt 4.19.84..4.20
    • Linux Kernel lt 5.3..6.1.167
    • Linux Kernel lt 6.2..6.6.130
    • Linux Kernel lt 6.7..6.12.77
    • Linux Kernel lt 6.13..6.18.17
    • Linux Kernel lt 6.19..6.19.7
    • Linux Kernel lt 6.20..7.0
    Fixed in
    • Linux Kernel 4.10
    • Linux Kernel 4.15
    • Linux Kernel 4.20
    • Linux Kernel 6.1.167
    • Linux Kernel 6.6.130
    • Linux Kernel 6.12.77
    • Linux Kernel 6.18.17
    • Linux Kernel 6.19.7
    • Linux Kernel 7.0

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.4

    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
    43.06 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
    2.4
    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: scsi: target: Fix recursive locking in __configfs_open_file() In flush_write_buffer, &p->frag_sem is acquired and then the loaded store function is called, which, here, is target_core_item_dbroot_store(). This function called filp_open(), following which these functions were called (in reverse order), according to the call trace: down_read __configfs_open_file do_dentry_open vfs_open do_open path_openat do_filp_open file_open_name filp_open target_core_item_dbroot_store flush_write_buffer configfs_write_iter target_core_item_dbroot_store() tries to validate the new file path by trying to open the file path provided to it; however, in this case, the bug report shows: db_root: not a directory: /sys/kernel/config/target/dbroot indicating that the same configfs file was tried to be opened, on which it is currently working on. Thus, it is trying to acquire frag_sem semaphore of the same file of which it already holds the semaphore obtained in flush_write_buffer(), leading to acquiring the semaphore in a nested manner and a possibility of recursive locking. Fix this by modifying target_core_item_dbroot_store() to use kern_path() instead of filp_open() to avoid opening the file using filesystem-specific function __configfs_open_file(), and further modifying it to make this fix compatible.

    Source: Debian LTS Advisories, Debian Security Advisories, siemens_advisory, Ubuntu Security Notices, suse_csaf, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), Microsoft Security Update Guide, CVE.org (MITRE), 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
    • 5.3 – < 6.1.167
    • 6.7 – < 6.12.77
    • 6.2 – < 6.6.130
    • 4.9.201 – < 4.10
    • 6.20 – < 7.0
    • 4.19.84 – < 4.20
    • 6.19 – < 6.19.7
    • 6.13 – < 6.18.17
    • 4.14.154 – < 4.15
    • 6.1.167
    • 6.12.77
    • 6.6.130
    • 4.10
    • 7.0
    • 4.20
    • 6.19.7
    • 6.18.17
    • 4.15
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxtrixie
    Linuxdebianlinux-6.1bullseye
    Linuxlinuxlinux_kernel5.3
    Linuxlinuxlinux_kernel7.0
    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 18 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/142eacb50fb903a4c10dee7e67b6e79ebb36a582
      Referenceadded
      —
      https://git.kernel.org/stable/c/14d4ac19d1895397532eec407433c5d74d9da53b
      Referenceadded
      —
      https://git.kernel.org/stable/c/3161ef61f121d4573cad5b57c92188dcd9b284b3
      Referenceadded
      —
      https://git.kernel.org/stable/c/4fcfa424a581d823cb1a9676e3eefe6ca17e453a
      Referenceadded
      —
      https://git.kernel.org/stable/c/9a5641024fbfd9b24fe65984ad85fea10a3ae438
      Referenceadded
      —
      https://git.kernel.org/stable/c/e8ef82cb6443d5f3260b1b830e17f03dda4229ea
      Referenceremoved
      https://git.kernel.org/stable/c/142eacb50fb903a4c10dee7e67b6e79ebb36a582
      —
      Referenceremoved
      https://git.kernel.org/stable/c/14d4ac19d1895397532eec407433c5d74d9da53b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3161ef61f121d4573cad5b57c92188dcd9b284b3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4fcfa424a581d823cb1a9676e3eefe6ca17e453a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9a5641024fbfd9b24fe65984ad85fea10a3ae438
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e8ef82cb6443d5f3260b1b830e17f03dda4229ea
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/142eacb50fb903a4c10dee7e67b6e79ebb36a582 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/14d4ac19d1895397532eec407433c5d74d9da53b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3161ef61f121d4573cad5b57c92188dcd9b284b3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4fcfa424a581d823cb1a9676e3eefe6ca17e453a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/9a5641024fbfd9b24fe65984ad85fea10a3ae438 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e8ef82cb6443d5f3260b1b830e17f03dda4229ea 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/2026/23xxx/CVE-2026-23292.json">CVE-2026-23292</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

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