HighCVE-2026-46209

    Linux Kernel: security vulnerability (CVE-2026-46209)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned int width = mode_cmd->width / (i ? info->hsub : 1); unsigned int height = mode_cmd->height / (i ? info->vsub : 1); However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses drm_format_info_plane_width/height() which round up dimensions via DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object size check for certain pixel format and dimension combinations.

    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 4.14..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..6.12.90
    • Linux Kernel lt 6.13..6.18.32
    • Linux Kernel lt 6.19..7.0.9
    Fixed in
    • Linux Kernel 5.10.258
    • Linux Kernel 5.15.209
    • Linux Kernel 6.1.175
    • Linux Kernel 6.6.140
    • Linux Kernel 6.12.90
    • Linux Kernel 6.18.32
    • Linux Kernel 7.0.9
    • 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: Vendor (CNA), CVSS v3

    7.8

    CVSS v3

    Severity High on the scale from 0 to 10.

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 3.5

    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
    57.06 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
    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
    3.5
    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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 16 October 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-190

    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: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned int width = mode_cmd->width / (i ? info->hsub : 1); unsigned int height = mode_cmd->height / (i ? info->vsub : 1); However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses drm_format_info_plane_width/height() which round up dimensions via DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object size check for certain pixel format and dimension combinations. For example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the GEM size validation path sees height=0 instead of height=1. The expression (height - 1) then wraps to UINT_MAX as an unsigned int, causing min_size to overflow and wrap back to a small value. A tiny GEM object therefore passes the size guard, yet when the GPU accesses the chroma plane it will read or write memory beyond the object's bounds. Fix by replacing the open-coded divisions with drm_format_info_plane_width() and drm_format_info_plane_height(), which use DIV_ROUND_UP() and match the calculation already used in framebuffer_check().

    Source: suse_csaf, Debian LTS Advisories, redhat_csaf, BSI WID Portal, BSI CSAF, Ubuntu Security Notices, siemens_advisory, 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
    • 5.16 – < 6.1.175
    • 6.2 – < 6.6.140
    • 4.14 – < 5.10.258
    • 6.19 – < 7.0.9
    • 6.13 – < 6.18.32
    • 5.11 – < 5.15.209
    • —
    • 6.7 – < 6.12.90
    • 6.1.175
    • 6.6.140
    • 5.10.258
    • 7.0.9
    • 6.18.32
    • 5.15.209
    • 7.1
    • 6.12.90
    IBMQRadar SIEM
    • <7.5.0 UP15 IF06
    • —
    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
    Linuxlinuxlinux_kernel7.1
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-190Integer Overflow or Wraparound

      Base

      The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

      Entry at MITRE CWE-190

    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 modifiedCISA ADP

      Weakness type: CWE-190

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-190

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-46209","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:21:11.129059Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. Record modifiedLinux

      Show 24 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430
      Referenceadded
      —
      https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d
      Referenceadded
      —
      https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580
      Referenceadded
      —
      https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2
      Referenceadded
      —
      https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf
      Referenceadded
      —
      https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3
      Referenceadded
      —
      https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad
      Referenceadded
      —
      https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950
      Referenceremoved
      https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430
      —
      Referenceremoved
      https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580
      —
      Referenceremoved
      https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf
      —
      Referenceremoved
      https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad
      —
      Referenceremoved
      https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950 Types: Patch
      —

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

    4. 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-2026-46209.json">CVE-2026-46209</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    5. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (5.16 – before 6.1.175; 5.11 – before 5.15.209; 6.2 – before 6.6.140; 6.13 – before 6.18.32; 6.7 – before 6.12.90; 6.19 – before 7.0.9; 4.14 – before 5.10.258; 1 individual version)

      Weakness type: CWE-787

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-787
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *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) 6.2 up to (excluding) 6.6.140 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.32 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.90 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.9 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14 up to (excluding) 5.10.258
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1a17ea9861e89585361caa8bc231bd22dc6dbe7d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950 Types: Patch

      Source identifier: nvd@nist.gov

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