HighCVE-2026-80909

    Linux Kernel: security vulnerability (CVE-2026-80909)

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

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Reject UVD message with invalid number of h265 refs Same change as for h264, avoids overflow later when calculating min dpb size. (cherry picked from commit a4b0720e4f1601f97f59a2be9c1b4b94fa6527d5)

    Update Linux Kernel to version 5.10.266, Linux Kernel to version 5.15.217, Linux Kernel to version 6.1.184.

    Affected
    • Linux Kernel lt 4.2..5.10.266
    • Linux Kernel lt 5.11..5.15.217
    • Linux Kernel lt 5.16..6.1.184
    • Linux Kernel lt 6.2..6.6.153
    • Linux Kernel lt 6.7..6.12.105
    • Linux Kernel lt 6.13..6.18.46
    • Linux Kernel lt 6.19..7.1.10
    Fixed in
    • Linux Kernel 5.10.266
    • Linux Kernel 5.15.217
    • Linux Kernel 6.1.184
    • Linux Kernel 6.6.153
    • Linux Kernel 6.12.105
    • Linux Kernel 6.18.46
    • Linux Kernel 7.1.10
    • Linux Kernel 7.2

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

    Metrics

    7.8

    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, Ubuntu, HKCERT, Debian LTS, EUVD, CVE.org, Msrc Update Guide, BSI

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 5.7

    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
    63.13 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
    0.2 %
    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
    5.7
    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
    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/amdgpu: Reject UVD message with invalid number of h265 refs Same change as for h264, avoids overflow later when calculating min dpb size. (cherry picked from commit a4b0720e4f1601f97f59a2be9c1b4b94fa6527d5)

    Source: suse_csaf, Ubuntu Security Notices, HKCERT (CC BY 3.0 HK) · HKCERT rating: medium, Debian LTS Advisories, ENISA EUVD, cvelistv5, NVD (NIST), CVE.org (MITRE), Microsoft Security Update Guide, BSI WID Portal, BSI CSAF

    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
    • 4.2 – < 5.10.266
    • 6.2 – < 6.6.153
    • 6.19 – < 7.1.10
    • 5.16 – < 6.1.184
    • 6.7 – < 6.12.105
    • 5.11 – < 5.15.217
    • 6.13 – < 6.18.46
    • —
    • 5.10.266
    • 6.6.153
    • 7.1.10
    • 6.1.184
    • 6.12.105
    • 5.15.217
    • 6.18.46
    • 7.2
    Red HatOpenShift
    • Container Platform
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxubuntulinuxjammy
    Linuxubuntulinuxnoble
    Linuxubuntulinuxresolute
    Linuxdebianlinux-6.12bookworm
    Linuxubuntulinux-awsjammy
    Linuxubuntulinux-awsnoble
    Linuxubuntulinux-awsresolute
    Linuxubuntulinux-aws-5.15focal
    Linuxubuntulinux-aws-6.8jammy
    Linuxubuntulinux-aws-7.0noble
    Linuxubuntulinux-aws-fipsjammy
    Linuxubuntulinux-aws-fipsnoble
    Linuxubuntulinux-azurejammy
    Linuxubuntulinux-azurenoble
    Linuxubuntulinux-azureresolute
    Linuxubuntulinux-azure-5.15focal
    Linuxubuntulinux-azure-6.8jammy
    Linuxubuntulinux-azure-fdenoble
    Linuxubuntulinux-azure-fderesolute
    Linuxubuntulinux-azure-fde-5.15focal
    Linuxubuntulinux-azure-fde-6.8jammy
    Linuxubuntulinux-azure-fde-7.0noble
    Linuxubuntulinux-azure-fipsjammy

    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

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/80xxx/CVE-2026-80909.json">CVE-2026-80909</a>

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

    2. ReceivedLinux

      Description added or changed

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Reject UVD message with invalid number of h265 refs Same change as for h264, avoids overflow later when calculating min dpb size. (cherry picked from commit a4b0720e4f1601f97f59a2be9c1b4b94fa6527d5)
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/80xxx/CVE-2026-80909.json">CVE-2026-80909</a>
      Referenceadded
      —
      https://git.kernel.org/stable/c/0acdf1a575f59bd46717d5c487d84575af5bee8f
      Referenceadded
      —
      https://git.kernel.org/stable/c/1facad2a78c1a8aeecc36eb4d560c7f1e10ce198
      Referenceadded
      —
      https://git.kernel.org/stable/c/2abcdc5f738574e7fcdd9417575dffb877fdc26f
      Referenceadded
      —
      https://git.kernel.org/stable/c/499907e5d46e575e96967c0230a0a6af980a17ab
      Referenceadded
      —
      https://git.kernel.org/stable/c/9fca434208f1f9ab977feac62df8ebb1cc7ce893
      Referenceadded
      —
      https://git.kernel.org/stable/c/a930c54cb67200de8bc0de87480d09ece7dcd85d
      Referenceadded
      —
      https://git.kernel.org/stable/c/cbf1c84bf5cac2b3742ea3d2085fa713424465cc
      Referenceadded
      —
      https://git.kernel.org/stable/c/e304c3e0d9ce251887be1f274aa0ed52219d5fd7

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

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