HighCVE-2026-46294

    Linux Kernel: Buffer Overflow (CVE-2026-46294)

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

    What is affected, what to do

    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

    7.8

    Priority

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

    Source: NVD, CVSS v3

    7.8

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: SUSE, Debian LTS, Ubuntu, Siemens ProductCERT, BSI, CVE.org

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 3.8

    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
    57.72 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
    7.8 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
    7.8
    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
    3.8
    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
    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:

    dm: fix a buffer overflow in ioctl processing

    Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status:

    1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there
    2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr);
    3. The alignment doesn't check overflow, so outptr could point past the buffer end
    4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf);
    5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number
    6. With "remaining" being high, the code writes more data past the end of the buffer

    Luckily, this bug has no security implications because:

    1. Only root can issue device mapper ioctls
    2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally

    Source: suse_csaf, Debian LTS Advisories, Ubuntu Security Notices, siemens_advisory, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), 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
    • 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_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/2fa49cc884f6496a915c35621ba4da35649bf159
      Referenceadded
      —
      https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
      Referenceadded
      —
      https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d
      Referenceadded
      —
      https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2
      Referenceadded
      —
      https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8
      Referenceadded
      —
      https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668
      Referenceadded
      —
      https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a
      Referenceadded
      —
      https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
      Referenceremoved
      https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159
      —
      Referenceremoved
      https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8
      —
      Referenceremoved
      https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a 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-2026-46294.json">CVE-2026-46294</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    3. ReceivedLinux

      Description added or changed

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
      Referenceadded
      —
      https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159
      Referenceadded
      —
      https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
      Referenceadded
      —
      https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d
      Referenceadded
      —
      https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2
      Referenceadded
      —
      https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8
      Referenceadded
      —
      https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668
      Referenceadded
      —
      https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a
      Referenceadded
      —
      https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a

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

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