HighCVE-2026-64219

    Linux Kernel: Stack-Based Buffer Overflow (CVE-2026-64219)

    Published Last modified Sources: SUSE, Ubuntu, Red Hat, BSI, Msrc Update Guide, CVE.org

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy.

    Update Linux Kernel to version 5.15.209, Linux Kernel to version 6.1.175, Linux Kernel to version 6.6.142.

    Affected
    • Linux Kernel lt 5.13..5.15.209
    • Linux Kernel lt 5.16..6.1.175
    • Linux Kernel lt 6.2..6.6.142
    • Linux Kernel lt 6.7..6.12.92
    • Linux Kernel lt 6.13..6.18.34
    • Linux Kernel lt 6.19..7.0.11
    Fixed in
    • Linux Kernel 5.15.209
    • Linux Kernel 6.1.175
    • Linux Kernel 6.6.142
    • Linux Kernel 6.12.92
    • Linux Kernel 6.18.34
    • Linux Kernel 7.0.11
    • Linux Kernel 7.1

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

    Metrics

    7.1

    Priority

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

    Source: NVD, CVSS v3

    7.0

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: SUSE, Ubuntu, Red Hat, BSI, Msrc Update Guide, CVE.org

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 5.8

    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
    56.50 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
    7.1 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
    7.0
    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
    0.2 %
    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
    5.8
    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
    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-121

    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/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)

    Source: suse_csaf, Ubuntu Security Notices, redhat_csaf, BSI WID Portal, BSI CSAF, Microsoft Security Update Guide, 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
    • 6.19 – < 7.0.11
    • 5.13 – < 5.15.209
    • 6.13 – < 6.18.34
    • —
    • 6.7 – < 6.12.92
    • 6.2 – < 6.6.142
    • 6.1.175
    • 7.0.11
    • 5.15.209
    • 6.18.34
    • 7.1
    • 6.12.92
    • 6.6.142
    IBMQRadar SIEM
    • < 7.6.0.3
    • <7.5.0 UP16 IF01
    • 7.6.0.3
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxubuntulinux-aws-fipsnoble
    Linuxlinuxlinux_kernel7.1
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-121Stack-based Buffer Overflow

      Variant

      A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

      Entry at MITRE CWE-121

    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-121

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-121

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

    2. Record modifiedLinux

      Show 21 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b
      Referenceadded
      —
      https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e
      Referenceadded
      —
      https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e
      Referenceadded
      —
      https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d
      Referenceadded
      —
      https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29
      Referenceadded
      —
      https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71
      Referenceadded
      —
      https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b
      Referenceremoved
      https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29
      —
      Referenceremoved
      https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b Types: Patch
      —

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

    3. 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-2026-64219","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:37:34.646600Z"}

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (5.13 – before 5.15.209; 5.16 – before 6.1.175; 6.7 – before 6.12.92; 6.13 – before 6.18.34; 6.19 – before 7.0.11; 6.2 – before 6.6.142; 4 individual versions)

      Weakness type: CWE-674

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-674
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.15.209 *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) 6.7 up to (excluding) 6.12.92 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.142
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b Types: Patch

      Source identifier: nvd@nist.gov

    5. ReceivedLinux

      Description added or changed

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Linux, Linux
      Descriptionadded
      —
      In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)
      Referenceadded
      —
      https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b
      Referenceadded
      —
      https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e
      Referenceadded
      —
      https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e
      Referenceadded
      —
      https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d
      Referenceadded
      —
      https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29
      Referenceadded
      —
      https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71
      Referenceadded
      —
      https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b

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

    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-64219
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-64219"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-64219.svg?lang=en" alt="CVE-2026-64219 – NEOSEC Intel" height="20"></a>