HighCVE-2026-45970

    Linux Kernel: Use-After-Free (CVE-2026-45970)

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

    Share

    What is affected, what to do

    A flaw was found in the Linux kernel's bonding driver, specifically within the Active-Backup Load Balancing (ALB) receive path. A local attacker can trigger a Use-After-Free (UAF) vulnerability in the rlb_arp_recv function by rapidly bringing a bond interface up and down while receiving Address Resolution Protocol (ARP) messages.

    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 3.0..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..6.18.14
    • Linux Kernel lt 6.19..6.19.4
    • 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 6.18.14
    • Linux Kernel 6.19.4
    • 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: Vendor (CNA), CVSS v3

    7.8

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Ubuntu, Debian LTS, SUSE, Red Hat, BSI, CVE.org, EUVD

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.3

    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
    56.83 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
    2.3
    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-416

    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 bonding driver, specifically within the Active-Backup Load Balancing (ALB) receive path. A local attacker can trigger a Use-After-Free (UAF) vulnerability in the rlb_arp_recv function by rapidly bringing a bond interface up and down while receiving Address Resolution Protocol (ARP) messages. This concurrent access to freed memory can lead to a null pointer dereference, resulting in a system crash and a Denial of Service (DoS).

    Source: Ubuntu Security Notices, Debian LTS Advisories, suse_csaf, 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 – < 6.19.4
    • 6.20 – < 7.0
    • 5.11 – < 5.15.202
    • 3.0 – < 5.10.252
    • 6.2 – < 6.6.128
    • 6.13 – < 6.18.14
    • 6.1.165
    • 6.12.75
    • 6.19.4
    • 7.0
    • 5.15.202
    • 5.10.252
    • 6.6.128
    • 6.18.14
    IBMQRadar SIEM
    • < 7.6.0.3
    • <7.5.0 UP16 IF01
    • 7.6.0.3
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbullseye
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-416Use After Free

      Variant

      The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

      Entry at MITRE CWE-416

    References & sources

    • git.kernel.orgstable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803ceuvd, Patch
    • git.kernel.orgstable/c/de7c097800f07f3c108185c7a38b53a530ba30ffeuvd, Patch
    • git.kernel.orgstable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1euvd, Patch
    • git.kernel.orgstable/c/f94a0de7b9f32745a14a1621c63087a092823587euvd, Patch
    • git.kernel.orgstable/c/c65cdf46ce340c9c00fbbaf84599d2daff43626eeuvd, Patch
    • git.kernel.orgstable/c/fef13c403be3fb685cb06419e6b3623106aab5baeuvd, Patch
    • git.kernel.orgstable/c/d31065526f160ee0244a719230aa069daca2bf4deuvd, Patch
    • git.kernel.orgstable/c/e6834a4c474697df23ab9948fd3577b26bf48656euvd, 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-416

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-416

      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/c65cdf46ce340c9c00fbbaf84599d2daff43626e
      Referenceadded
      —
      https://git.kernel.org/stable/c/d31065526f160ee0244a719230aa069daca2bf4d
      Referenceadded
      —
      https://git.kernel.org/stable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1
      Referenceadded
      —
      https://git.kernel.org/stable/c/de7c097800f07f3c108185c7a38b53a530ba30ff
      Referenceadded
      —
      https://git.kernel.org/stable/c/e6834a4c474697df23ab9948fd3577b26bf48656
      Referenceadded
      —
      https://git.kernel.org/stable/c/f94a0de7b9f32745a14a1621c63087a092823587
      Referenceadded
      —
      https://git.kernel.org/stable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c
      Referenceadded
      —
      https://git.kernel.org/stable/c/fef13c403be3fb685cb06419e6b3623106aab5ba
      Referenceremoved
      https://git.kernel.org/stable/c/c65cdf46ce340c9c00fbbaf84599d2daff43626e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d31065526f160ee0244a719230aa069daca2bf4d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1
      —
      Referenceremoved
      https://git.kernel.org/stable/c/de7c097800f07f3c108185c7a38b53a530ba30ff
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e6834a4c474697df23ab9948fd3577b26bf48656
      —
      Referenceremoved
      https://git.kernel.org/stable/c/f94a0de7b9f32745a14a1621c63087a092823587
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/fef13c403be3fb685cb06419e6b3623106aab5ba
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c65cdf46ce340c9c00fbbaf84599d2daff43626e Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d31065526f160ee0244a719230aa069daca2bf4d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/de7c097800f07f3c108185c7a38b53a530ba30ff Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e6834a4c474697df23ab9948fd3577b26bf48656 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/f94a0de7b9f32745a14a1621c63087a092823587 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/fef13c403be3fb685cb06419e6b3623106aab5ba 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-2026-45970","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:18:40.906017Z"}

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

    4. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (6.13 – before 6.18.14; 6.19 – before 6.19.4; 6.2 – before 6.6.128; 6.7 – before 6.12.75; 5.11 – before 5.15.202; 5.16 – before 6.1.165; 3.0 – before 5.10.252)

      Weakness type: CWE-416

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-416
      Product configurationadded
      —
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.128 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.75 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.202 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.165 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 5.10.252
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/c65cdf46ce340c9c00fbbaf84599d2daff43626e Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/d31065526f160ee0244a719230aa069daca2bf4d Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/db5435b5342e3aaa4521d0f3ccfe94316b253ca1 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/de7c097800f07f3c108185c7a38b53a530ba30ff Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/e6834a4c474697df23ab9948fd3577b26bf48656 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/f94a0de7b9f32745a14a1621c63087a092823587 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/fef13c403be3fb685cb06419e6b3623106aab5ba Types: Patch

      Source identifier: nvd@nist.gov

    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-45970
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-45970"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-45970.svg?lang=en" alt="CVE-2026-45970 – NEOSEC Intel" height="20"></a>