HighCVE-2026-53167

    Linux Kernel: security vulnerability (CVE-2026-53167)

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

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios FUSE_NOTIFY_RETRIEVE must be limited to uptodate folios; !uptodate folios can contain uninitialized data. Since FUSE_NOTIFY_RETRIEVE is intended to only return data that is already in the page cache and not wait for data from the FUSE daemon, treat !uptodate folios as if they weren't present.

    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 2.6.36..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..6.18.36
    • Linux Kernel lt 6.19..7.0.13
    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 6.18.36
    • Linux Kernel 7.0.13
    • Linux Kernel 7.1

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

    Metrics

    7.0

    Priority

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

    Source: Vendor (CNA), CVSS v3

    5.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

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

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.5

    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
    46.79 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
    7.0 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
    2.5
    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: fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios FUSE_NOTIFY_RETRIEVE must be limited to uptodate folios; !uptodate folios can contain uninitialized data. Since FUSE_NOTIFY_RETRIEVE is intended to only return data that is already in the page cache and not wait for data from the FUSE daemon, treat !uptodate folios as if they weren't present. This only has security impact on systems that don't enable automatic zero-initialization of all page allocations via CONFIG_INIT_ON_ALLOC_DEFAULT_ON or init_on_alloc=1.

    Source: suse_csaf, Ubuntu Security Notices, BSI WID Portal, BSI CSAF, siemens_advisory, Debian Security Advisories, Debian LTS Advisories, cvelistv5, Microsoft Security Update Guide, 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 – < 6.1.177
    • 5.11 – < 5.15.211
    • 6.13 – < 6.18.36
    • 6.7 – < 6.12.95
    • —
    • 2.6.36 – < 5.10.260
    • 6.2 – < 6.6.144
    • 6.19 – < 7.0.13
    • 6.1.177
    • 5.15.211
    • 6.18.36
    • 6.12.95
    • 7.1
    • 5.10.260
    • 6.6.144
    • 7.0.13
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxbullseye
    Linuxdebianlinuxtrixie
    Linuxubuntulinuxnoble
    Linuxdebianlinux-6.1bullseye
    Linuxubuntulinux-awsnoble
    Linuxubuntulinux-aws-fipsnoble
    Linuxubuntulinux-azurenoble
    Linuxubuntulinux-azure-fdenoble
    Linuxubuntulinux-azure-fipsnoble
    Linuxubuntulinux-fipsnoble
    Linuxubuntulinux-gcpnoble
    Linuxubuntulinux-gcp-fipsnoble
    Linuxubuntulinux-gkenoble
    Linuxubuntulinux-gkeopnoble
    Linuxubuntulinux-ibmnoble
    Linuxubuntulinux-lowlatencynoble
    Linuxubuntulinux-nvidiajammy
    Linuxubuntulinux-nvidia-tegrajammy
    Linuxubuntulinux-nvidia-tegra-5.15focal
    Linuxubuntulinux-nvidia-tegra-igxjammy
    Linuxubuntulinux-oraclenoble
    Linuxubuntulinux-realtimenoble
    Linuxlinuxlinux_kernel7.1

    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

      Show 26 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd
      Referenceadded
      —
      https://git.kernel.org/stable/c/4e14f29473eda18fb2af082dd2fd4c12139862cd
      Referenceadded
      —
      https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
      Referenceadded
      —
      https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba
      Referenceadded
      —
      https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42
      Referenceadded
      —
      https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90
      Referenceadded
      —
      https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5
      Referenceadded
      —
      https://git.kernel.org/stable/c/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c
      Referenceadded
      —
      https://project-zero.issues.chromium.org/issues/514653451
      Referenceremoved
      https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4e14f29473eda18fb2af082dd2fd4c12139862cd
      —
      Referenceremoved
      https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba
      —
      Referenceremoved
      https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42
      —
      Referenceremoved
      https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5
      —
      Referenceremoved
      https://git.kernel.org/stable/c/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c
      —
      Referenceremoved
      https://project-zero.issues.chromium.org/issues/514653451
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4e14f29473eda18fb2af082dd2fd4c12139862cd Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c Types: Patch
      —

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

    2. 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-2026-53167.json">CVE-2026-53167</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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

    3. Record modifiedLinux

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://project-zero.issues.chromium.org/issues/514653451

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (6.19 – before 7.0.13; 2.6.36 – before 6.18.36; 6 individual versions)

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

      Weakness type: CWE-908

      Show 11 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-908
      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) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.36 up to (excluding) 6.18.36
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4e14f29473eda18fb2af082dd2fd4c12139862cd Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c 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/4e14f29473eda18fb2af082dd2fd4c12139862cd
      Referenceadded
      —
      https://git.kernel.org/stable/c/651801d75ad0897dbd331b3cc6a4da3e78f60d42
      Referenceadded
      —
      https://git.kernel.org/stable/c/68a9282d5ea5b8780d59122505ad633e6daede90
      Referenceadded
      —
      https://git.kernel.org/stable/c/8bef2f840b43e0879478fe3aaa9ff2f0b80798a5
      Referenceadded
      —
      https://git.kernel.org/stable/c/feafe8ccb1584254f59fbd4946d6ca7ef1e3e99c
      Affected versions (publisher)changed
      Linux, Linux
      Linux, Linux

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

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