MediumCVE-2026-53325

    Linux Kernel: NULL Pointer Dereference (CVE-2026-53325)

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

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: agp/amd64: Fix broken error propagation in agp_amd64_probe() A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0).

    Update Linux Kernel to version 5.10.260, Linux Kernel to version 5.15.211, Linux Kernel to version 6.1.177.

    Affected
    • Linux Kernel lt 2.6.18..5.10.260
    • Linux Kernel lt 5.11..5.15.211
    • Linux Kernel lt 5.16..6.1.177
    • Linux Kernel lt 6.2..6.6.144
    • Linux Kernel lt 6.7..6.12.95
    • Linux Kernel lt 6.13..6.18.37
    • Linux Kernel lt 6.19..7.0.14
    • Linux Kernel lt 7.1..7.1.2
    Fixed in
    • Linux Kernel 5.10.260
    • Linux Kernel 5.15.211
    • Linux Kernel 6.1.177
    • Linux Kernel 6.6.144
    • Linux Kernel 6.12.95
    • Linux Kernel 6.18.37
    • Linux Kernel 7.0.14
    • Linux Kernel 7.1.2
    • Linux Kernel 7.2

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

    Metrics

    5.5

    Priority

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

    Source: NVD, CVSS v3

    5.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.6

    Show all metrics
    Severity
    Medium
    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
    47.19 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
    5.5 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
    5.5
    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
    2.6
    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
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    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: agp/amd64: Fix broken error propagation in agp_amd64_probe() A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0). The root cause of this crash is broken error propagation in agp_amd64_probe(): When no AMD northbridges are found, cache_nbs() correctly returns -ENODEV. However, the probe function erroneously checks the return value against exactly -1, rather than < 0. As a result, the hardware absence error is masked, allowing the driver to improperly proceed with initialization. It eventually calls agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware does not exist, node_to_amd_nb(0) returns NULL, leading to a General Protection Fault (GPF) when accessing its ->misc member. Fix the issue by correcting the error check in agp_amd64_probe() to abort properly when cache_nbs() returns any negative error code. This prevents the driver from erroneously proceeding without hardware, thereby avoiding the subsequent NULL pointer dereference at its source.

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

    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 – < 6.1.177
    • 5.11 – < 5.15.211
    • 7.1 – < 7.1.2
    • 6.13 – < 6.18.37
    • 2.6.18 – < 5.10.260
    • 6.7 – < 6.12.95
    • 6.2 – < 6.6.144
    • —
    • 6.19 – < 7.0.14
    • 6.1.177
    • 5.15.211
    • 7.1.2
    • 6.18.37
    • 5.10.260
    • 6.12.95
    • 6.6.144
    • 7.2
    • 7.0.14
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxbullseye
    Linuxdebianlinuxtrixie
    Linuxdebianlinux-6.1bullseye
    Linuxubuntulinux-oracle-7.0noble
    Linuxlinuxlinux_kernel—

    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 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/2026/53xxx/CVE-2026-53325.json">CVE-2026-53325</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    2. Record modifiedLinux

      Show 27 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585
      Referenceadded
      —
      https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b
      Referenceadded
      —
      https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84
      Referenceadded
      —
      https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1
      Referenceadded
      —
      https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f
      Referenceadded
      —
      https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30
      Referenceadded
      —
      https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759
      Referenceadded
      —
      https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a
      Referenceadded
      —
      https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869
      Referenceremoved
      https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585
      —
      Referenceremoved
      https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84
      —
      Referenceremoved
      https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1
      —
      Referenceremoved
      https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f
      —
      Referenceremoved
      https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759
      —
      Referenceremoved
      https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869 Types: Patch
      —

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

    3. 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)changed
      Linux, Linux
      Linux, Linux

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (5.16 – before 6.1.177; 6.2 – before 6.6.144; 6.7 – before 6.12.95; 5.11 – before 5.15.211; 2.6.18 – before 5.10.260; 6.13 – before 6.18.37; 6.19 – before 7.0.14; 7.1 – before 7.1.2)

      CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-476

      Show 12 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-476
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.177 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.144 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.95 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.211 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.18 up to (excluding) 5.10.260 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 7.1 up to (excluding) 7.1.2
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869 Types: Patch

      Source identifier: nvd@nist.gov

    5. Record modifiedLinux

      Show 6 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b
      Referenceadded
      —
      https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84
      Referenceadded
      —
      https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f
      Referenceadded
      —
      https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759
      Referenceadded
      —
      https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869
      Affected versions (publisher)changed
      Linux, Linux
      Linux, Linux

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

    Show one older change

    1. ReceivedLinux

      Description added or changed

      Show 6 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: agp/amd64: Fix broken error propagation in agp_amd64_probe() A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0). The root cause of this crash is broken error propagation in agp_amd64_probe(): When no AMD northbridges are found, cache_nbs() correctly returns -ENODEV. However, the probe function erroneously checks the return value against exactly -1, rather than < 0. As a result, the hardware absence error is masked, allowing the driver to improperly proceed with initialization. It eventually calls agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware does not exist, node_to_amd_nb(0) returns NULL, leading to a General Protection Fault (GPF) when accessing its ->misc member. Fix the issue by correcting the error check in agp_amd64_probe() to abort properly when cache_nbs() returns any negative error code. This prevents the driver from erroneously proceeding without hardware, thereby avoiding the subsequent NULL pointer dereference at its source.
      Referenceadded
      —
      https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585
      Referenceadded
      —
      https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1
      Referenceadded
      —
      https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30
      Referenceadded
      —
      https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a

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

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