CriticalCVE-2026-53374

    Linux Kernel: security vulnerability (CVE-2026-53374)

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

    What is affected, what to do

    A flaw was found in the Linux kernel's AMD GPU (amdgpu) driver. When allocating a Graphics Address Remapping Table (GART), the memory was not properly initialized.

    Update Linux Kernel to version 6.1.175, Linux Kernel to version 6.6.140, Linux Kernel to version 6.12.90.

    Affected
    • Linux Kernel lt 4.2..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 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

    9.8

    Priority

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

    Source: NVD, CVSS v3

    8.8

    CVSS v3

    Severity High on the scale from 0 to 10.

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.4

    Show all metrics
    Severity
    Critical
    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
    64.91 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
    9.8 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
    8.8
    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
    2.4
    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-457

    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 AMD GPU (amdgpu) driver. When allocating a Graphics Address Remapping Table (GART), the memory was not properly initialized. This could allow a local attacker to potentially access uninitialized memory, leading to information disclosure or unexpected system behavior due to the GPU using stale data from its Translation Lookaside Buffer (TLB).

    Source: suse_csaf, Ubuntu Security Notices, redhat_csaf, BSI WID Portal, BSI CSAF, NVD (NIST), Microsoft Security Update Guide, CVE.org (MITRE), cvelistv5

    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
    • 6.2 – < 6.6.140
    • 4.2 – < 6.1.175
    • 6.19 – < 7.0.9
    • 6.13 – < 6.18.32
    • —
    • 6.7 – < 6.12.90
    • 6.6.140
    • 6.1.175
    • 7.0.9
    • 6.18.32
    • 7.1
    • 6.12.90
    IBMQRadar SIEM
    • < 7.6.0.3
    • <7.5.0 UP16 IF01
    • 7.6.0.3
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxlinuxlinux_kernel7.1
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-457Use of Uninitialized Variable

      Variant

      The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

      Entry at MITRE CWE-457

    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-457

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-457

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

    2. Record modifiedLinux

      Show 18 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/40df11255d71b02e20e70579f1b12b687e396e26
      Referenceadded
      —
      https://git.kernel.org/stable/c/791941be5da125d9a1b228582bfdc300c05d05b3
      Referenceadded
      —
      https://git.kernel.org/stable/c/8ae8b9e74bab94aab1d79f1688129bcc61c8b29a
      Referenceadded
      —
      https://git.kernel.org/stable/c/91fbb5e635c8fb1b49e15c19da06480089ef719f
      Referenceadded
      —
      https://git.kernel.org/stable/c/b17175d0a375b3ed5e81597dac4983fdb46e478d
      Referenceadded
      —
      https://git.kernel.org/stable/c/e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741
      Referenceremoved
      https://git.kernel.org/stable/c/40df11255d71b02e20e70579f1b12b687e396e26
      —
      Referenceremoved
      https://git.kernel.org/stable/c/791941be5da125d9a1b228582bfdc300c05d05b3
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8ae8b9e74bab94aab1d79f1688129bcc61c8b29a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/91fbb5e635c8fb1b49e15c19da06480089ef719f
      —
      Referenceremoved
      https://git.kernel.org/stable/c/b17175d0a375b3ed5e81597dac4983fdb46e478d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/40df11255d71b02e20e70579f1b12b687e396e26 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/791941be5da125d9a1b228582bfdc300c05d05b3 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8ae8b9e74bab94aab1d79f1688129bcc61c8b29a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/91fbb5e635c8fb1b49e15c19da06480089ef719f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/b17175d0a375b3ed5e81597dac4983fdb46e478d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741 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-2026-53374","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:29:33.338896Z"}

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (6.2 – before 6.6.140; 6.13 – before 6.18.32; 6.7 – before 6.12.90; 6.19 – before 7.0.9; 4.2 – before 6.1.175; 2 individual versions)
      Show 8 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      NVD-CWE-noinfo
      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:*:*:*:*:*:*:*:* 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) 4.2 up to (excluding) 6.1.175
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/40df11255d71b02e20e70579f1b12b687e396e26 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/791941be5da125d9a1b228582bfdc300c05d05b3 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/8ae8b9e74bab94aab1d79f1688129bcc61c8b29a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/91fbb5e635c8fb1b49e15c19da06480089ef719f Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/b17175d0a375b3ed5e81597dac4983fdb46e478d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741 Types: Patch

      Source identifier: nvd@nist.gov

    5. ReceivedLinux

      Description added or changed

      Show 8 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/amdgpu: zero-initialize GART table on allocation GART TLB is flushed after unmapping but not after mapping. Since amdgpu_bo_create_kernel() does not zero-initialize the buffer, when a single PTE is written the TLB may speculatively load other uninitialized entries from the same cacheline. Those garbage entries can appear valid, and a subsequent write to another PTE in the same cacheline may cause the GPU to use a stale garbage PTE from the TLB. Fix this by calling memset_io() to zero-initialize the GART table with gart_pte_flags immediately after allocation. Using AMDGPU_GEM_CREATE_VRAM_CLEARED, SDMA-based clear will not work since SDMA needs GART to be initialized to work. (cherry picked from commit d9af8263b82b6eaa60c5718e0c6631c5037e4b24)
      Referenceadded
      —
      https://git.kernel.org/stable/c/40df11255d71b02e20e70579f1b12b687e396e26
      Referenceadded
      —
      https://git.kernel.org/stable/c/791941be5da125d9a1b228582bfdc300c05d05b3
      Referenceadded
      —
      https://git.kernel.org/stable/c/8ae8b9e74bab94aab1d79f1688129bcc61c8b29a
      Referenceadded
      —
      https://git.kernel.org/stable/c/91fbb5e635c8fb1b49e15c19da06480089ef719f
      Referenceadded
      —
      https://git.kernel.org/stable/c/b17175d0a375b3ed5e81597dac4983fdb46e478d
      Referenceadded
      —
      https://git.kernel.org/stable/c/e6c2e6c2e1fa066968a16aca1cb66cd1bdde7741

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

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