HighCVE-2026-64189

    Linux Kernel: Use-After-Free (CVE-2026-64189)

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

    What is affected, what to do

    A flaw was found in the Linux kernel's netfilter ipset component. A race condition exists between the `ip_set_list` resize operation and dump operations.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Conflicting version data — version display is hidden until the data is resolved.

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

    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
    59.93 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-362

    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 netfilter ipset component. A race condition exists between the `ip_set_list` resize operation and dump operations. This can lead to a use-after-free vulnerability, where memory is accessed after it has been deallocated. A successful exploitation of this flaw could result in a kernel panic, effectively causing a Denial of Service (DoS) on the system.

    Source: suse_csaf, Ubuntu Security Notices, redhat_csaf, Debian LTS Advisories, Debian Security Advisories, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST), Microsoft Security Update Guide, 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
    • 5.11 – < 5.15.212
    • 4.19.5 – < 4.20
    • 6.19 – < 7.1.4
    • 6.2 – < 6.6.145
    • 4.20 – < 5.10.261
    • 6.7 – < 6.12.96
    • —
    • 6.13 – < 6.18.39
    • 5.16 – < 6.1.178
    • 5.15.212
    • 4.20
    • 7.1.4
    • 6.6.145
    • 5.10.261
    • 6.12.96
    • 7.2
    • 6.18.39
    • 6.1.178
    IBMQRadar SIEM
    • < 7.6.0.3
    • <7.5.0 UP16 IF01
    • 7.6.0.3
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxbullseye
    Linuxdebianlinuxtrixie
    Linuxdebianlinux-6.1bullseye
    Linuxdebianlinux-6.12bookworm
    Linuxlinuxlinux_kernel4.20
    Linuxlinuxlinux_kernel7.2
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

      Class

      The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

      Entry at MITRE CWE-362

    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-362

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      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
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      CWE-362

      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/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e
      Referenceadded
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      https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab
      Referenceadded
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      https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093
      Referenceadded
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      https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5
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      https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4
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      https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710
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      https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f
      Referenceadded
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      https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943
      Referenceremoved
      https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab
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      Referenceremoved
      https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093
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      Referenceremoved
      https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5
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      Referenceremoved
      https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4
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      Referenceremoved
      https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710
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      Referenceremoved
      https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f
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      Referenceremoved
      https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943
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      Reference typeremoved
      https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e Types: Patch
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      Reference typeremoved
      https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943 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-2026-64189","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:37:21.088699Z"}

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

    4. 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

    5. Initial analysis by NVDNVD

      Newly listed as affected:
      • Linux Kernel (5.11 – before 5.15.212; 5.16 – before 6.1.178; 6.2 – before 6.6.145; 6.7 – before 6.12.96; 6.13 – before 6.18.39; 6.19 – before 7.1.4; 4.19.5 – before 4.20; 4.20.1 – before 5.10.261; 8 individual versions)

      Weakness type: CWE-362

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
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      CWE-362
      Product configurationadded
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      OR *cpe:2.3:o:linux:linux_kernel:4.20:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:4.20:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.96 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19.5 up to (excluding) 4.20 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20.1 up to (excluding) 5.10.261
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093 Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5 Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4 Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f Types: Patch
      Reference typeadded
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      kernel.org: https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943 Types: Patch

      Source identifier: nvd@nist.gov

    Show 2 older changes

    1. Record modifiedLinux

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e
      Referenceadded
      —
      https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5
      Referenceadded
      —
      https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4
      Referenceadded
      —
      https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710
      Affected versions (publisher)changed
      Linux, Linux
      Linux, Linux

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

    2. 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: netfilter: ipset: fix race between dump and ip_set_list resize The release path of ip_set_dump_do() and ip_set_dump_done() read inst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw() of the array pointer. These run from netlink_recvmsg() without the nfnl mutex and without an RCU read-side critical section. A concurrent ip_set_create() can grow the array: it publishes the new array, calls synchronize_net() and then kvfree()s the old one. Since the dump paths read the array outside any RCU reader, synchronize_net() does not wait for them and the old array can be freed while they still index into it, causing a use-after-free. The dumped set itself stays pinned via set->ref_netlink, so only the array load needs protecting. Take rcu_read_lock() around it, matching ip_set_get_byname() and __ip_set_put_byindex(). BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) Read of size 8 at addr ffff88800b5c4018 by task exploit/150 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) netlink_dump (net/netlink/af_netlink.c:2325) netlink_recvmsg (net/netlink/af_netlink.c:1976) sock_recvmsg (net/socket.c:1159) __sys_recvfrom (net/socket.c:2315) ... Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7] RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698) Kernel panic - not syncing: Fatal exception
      Referenceadded
      —
      https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab
      Referenceadded
      —
      https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093
      Referenceadded
      —
      https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f
      Referenceadded
      —
      https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943

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

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