CriticalCVE-2026-72319

    Linux Kernel: security vulnerability (CVE-2026-72319)

    Published Last modified Sources: Ubuntu, SUSE, CVE.org, BSI

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: ipvs: ensure inner headers in ICMP errors are in headroom Sashiko points out that after stripping the outer headers with pskb_pull() we should ensure the inner IP headers in ICMP errors from tunnels are present in the skb headroom for functions like ipv4_update_pmtu(), icmp_send() and IP_VS_DBG(). Also, add more checks for the length of the inner headers.

    Update Linux Kernel to version 5.10.261, Linux Kernel to version 5.15.212, Linux Kernel to version 6.1.178.

    Affected
    • Linux Kernel lt 3.7..5.10.261
    • Linux Kernel lt 5.11..5.15.212
    • Linux Kernel lt 5.16..6.1.178
    • Linux Kernel lt 6.2..6.6.145
    • Linux Kernel lt 6.7..6.12.97
    • Linux Kernel lt 6.13..6.18.40
    • Linux Kernel lt 6.19..7.1.5
    Fixed in
    • Linux Kernel 5.10.261
    • Linux Kernel 5.15.212
    • Linux Kernel 6.1.178
    • Linux Kernel 6.6.145
    • Linux Kernel 6.12.97
    • Linux Kernel 6.18.40
    • Linux Kernel 7.1.5
    • Linux Kernel 7.2

    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: Vendor (CNA), CVSS v3

    9.8

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: Ubuntu, SUSE, CVE.org, BSI

    0.8 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 54.9

    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
    95.82 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
    9.8
    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
    0.8 %
    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
    54.9
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    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 · automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 16 October 2026

    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: ipvs: ensure inner headers in ICMP errors are in headroom Sashiko points out that after stripping the outer headers with pskb_pull() we should ensure the inner IP headers in ICMP errors from tunnels are present in the skb headroom for functions like ipv4_update_pmtu(), icmp_send() and IP_VS_DBG(). Also, add more checks for the length of the inner headers.

    Source: Ubuntu Security Notices, suse_csaf, cvelistv5, NVD (NIST), 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
    • 6.7 – < 6.12.97
    • 6.19 – < 7.1.5
    • 5.11 – < 5.15.212
    • 6.2 – < 6.6.145
    • —
    • 6.13 – < 6.18.40
    • 5.16 – < 6.1.178
    • 3.7 – < 5.10.261
    • 6.12.97
    • 7.1.5
    • 5.15.212
    • 6.6.145
    • 7.2
    • 6.18.40
    • 6.1.178
    • 5.10.261

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxubuntulinuxnoble
    Linuxubuntulinuxresolute
    Linuxubuntulinux-awsnoble
    Linuxubuntulinux-awsresolute
    Linuxubuntulinux-aws-7.0noble
    Linuxubuntulinux-aws-fipsnoble
    Linuxubuntulinux-azurenoble
    Linuxubuntulinux-azureresolute
    Linuxubuntulinux-azure-7.0noble
    Linuxubuntulinux-azure-fdenoble
    Linuxubuntulinux-azure-fderesolute
    Linuxubuntulinux-azure-fde-7.0noble
    Linuxubuntulinux-azure-fipsnoble
    Linuxubuntulinux-fipsnoble
    Linuxubuntulinux-gcpnoble
    Linuxubuntulinux-gcp-fipsnoble
    Linuxubuntulinux-gkenoble
    Linuxubuntulinux-gkeopnoble
    Linuxubuntulinux-hwe-7.0noble
    Linuxubuntulinux-ibmnoble
    Linuxubuntulinux-ibmresolute
    Linuxubuntulinux-lowlatencynoble
    Linuxubuntulinux-nvidiajammy
    Linuxubuntulinux-nvidia-tegrajammy

    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 16 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40
      Referenceadded
      —
      https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c
      Referenceadded
      —
      https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf
      Referenceadded
      —
      https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2
      Referenceadded
      —
      https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875
      Referenceadded
      —
      https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326
      Referenceadded
      —
      https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec
      Referenceadded
      —
      https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d
      Referenceremoved
      https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40
      —
      Referenceremoved
      https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf
      —
      Referenceremoved
      https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875
      —
      Referenceremoved
      https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326
      —
      Referenceremoved
      https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec
      —
      Referenceremoved
      https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d
      —

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

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-72319","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:46:50.262793Z"}

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

    3. Record modifiedLinux

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

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
      Affected versions (publisher)changed
      Linux, Linux
      Linux, Linux

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

    4. ReceivedLinux

      Description added or changed

      Show 10 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: ipvs: ensure inner headers in ICMP errors are in headroom Sashiko points out that after stripping the outer headers with pskb_pull() we should ensure the inner IP headers in ICMP errors from tunnels are present in the skb headroom for functions like ipv4_update_pmtu(), icmp_send() and IP_VS_DBG(). Also, add more checks for the length of the inner headers.
      Referenceadded
      —
      https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40
      Referenceadded
      —
      https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c
      Referenceadded
      —
      https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf
      Referenceadded
      —
      https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2
      Referenceadded
      —
      https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875
      Referenceadded
      —
      https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326
      Referenceadded
      —
      https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec
      Referenceadded
      —
      https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d

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

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