HighCVE-2026-43206

    Linux Kernel: Out-of-Bounds Write (CVE-2026-43206)

    Published Last modified Sources: SUSE, Ubuntu, Debian LTS, Red Hat, BSI, CVE.org, EUVD

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    What is affected, what to do

    A flaw was found in the Linux kernel's drm/amdkfd component. An unprivileged local user can exploit an out-of-bounds write vulnerability in the kfd_event_page_set() function.

    Update Linux Kernel to version 5.10.252, Linux Kernel to version 5.15.202, Linux Kernel to version 6.1.165.

    Affected
    • Linux Kernel lt 4.17..5.10.252
    • Linux Kernel lt 5.11..5.15.202
    • Linux Kernel lt 5.16..6.1.165
    • Linux Kernel lt 6.2..6.6.128
    • Linux Kernel lt 6.7..6.12.75
    • Linux Kernel lt 6.13..6.18.16
    • Linux Kernel lt 6.19..6.19.6
    • Linux Kernel lt 6.20..7.0
    Fixed in
    • Linux Kernel 5.10.252
    • Linux Kernel 5.15.202
    • Linux Kernel 6.1.165
    • Linux Kernel 6.6.128
    • Linux Kernel 6.12.75
    • Linux Kernel 6.18.16
    • Linux Kernel 6.19.6
    • Linux Kernel 7.0

    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, Ubuntu, Debian LTS, Red Hat, BSI, CVE.org, EUVD

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 3.3

    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
    55.98 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
    3.3
    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-787

    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

    A flaw was found in the Linux kernel's drm/amdkfd component. An unprivileged local user can exploit an out-of-bounds write vulnerability in the kfd_event_page_set() function. This occurs because the function writes data without properly validating the buffer size, allowing a small buffer to trigger a write beyond its allocated memory. Successful exploitation of this flaw could lead to potential privilege escalation.

    Source: suse_csaf, Ubuntu Security Notices, Debian LTS Advisories, redhat_csaf, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), ENISA EUVD, 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 – < 6.1.165
    • 6.7 – < 6.12.75
    • 6.19 – < 6.19.6
    • 6.20 – < 7.0
    • 6.13 – < 6.18.16
    • 5.11 – < 5.15.202
    • 4.17 – < 5.10.252
    • 6.2 – < 6.6.128
    • 6.1.165
    • 6.12.75
    • 6.19.6
    • 7.0
    • 6.18.16
    • 5.15.202
    • 5.10.252
    • 6.6.128
    IBMQRadar SIEM
    • < 7.6.0.3
    • <7.5.0 UP16 IF01
    • 7.6.0.3
    • —
    MicrosoftAzure Linux
    • azl3
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbullseye
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-787Out-of-bounds Write

      Base

      The product writes data past the end, or before the beginning, of the intended buffer.

      Entry at MITRE CWE-787

    References & sources

    • git.kernel.orgstable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412deuvd, Patch
    • git.kernel.orgstable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781feuvd, Patch
    • git.kernel.orgstable/c/b4034442cb090e4a980bdcc1540948606cbc951beuvd, Patch
    • git.kernel.orgstable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940euvd, Patch
    • git.kernel.orgstable/c/75fb57efdd7863fffbc39db23e9cad7aafda26edeuvd, Patch
    • git.kernel.orgstable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20beuvd, Patch
    • git.kernel.orgstable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9beuvd, Patch
    • git.kernel.orgstable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96deuvd, Patch

    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-787

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-787

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

    2. Record modifiedLinux

      Show 24 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d
      Referenceadded
      —
      https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940
      Referenceadded
      —
      https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b
      Referenceadded
      —
      https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed
      Referenceadded
      —
      https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d
      Referenceadded
      —
      https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b
      Referenceadded
      —
      https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b
      Referenceadded
      —
      https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f
      Referenceremoved
      https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f 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-2026-43206","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:15:43.887589Z"}

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

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