MediumCVE-2026-64187

    Linux Kernel: NULL Pointer Dereference (CVE-2026-64187)

    Published Last modified Sources: SUSE, Ubuntu, HKCERT, Debian LTS, Debian, BSI, EUVD, 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: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none.

    Update Linux Kernel to version 5.15.212, Linux Kernel to version 6.1.178, Linux Kernel to version 6.6.145.

    Affected
    • Linux Kernel lt 4.3..5.15.212
    • Linux Kernel lt 5.16..6.1.178
    • Linux Kernel lt 6.2..6.6.145
    • Linux Kernel lt 6.7..6.12.96
    • Linux Kernel lt 6.13..6.18.39
    • Linux Kernel lt 6.19..7.1.4
    Fixed in
    • Linux Kernel 5.15.212
    • Linux Kernel 6.1.178
    • Linux Kernel 6.6.145
    • Linux Kernel 6.12.96
    • Linux Kernel 6.18.39
    • Linux Kernel 7.1.4
    • Linux Kernel 7.2

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

    Metrics

    5.5

    XIEM Effective CVSS

    Highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    0.0

    CVSS v3

    Severity Not rated on the scale from 0 to 10.

    Source: SUSE, Ubuntu, HKCERT, Debian LTS, Debian, BSI, EUVD, CVE.org, Msrc Update Guide

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 1.5

    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
    20.18 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
    0.0
    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
    1.5
    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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 6 November 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
    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: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none. The runtime commit path never emits such a transaction, so this only happens on a crafted log. It came from an AI-assisted code audit of the recovery parser. xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads *(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL ri_buf. Reject it there, before the commit handlers that also read ri_buf[0]. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836) xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043) xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501) xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244) xlog_recover (fs/xfs/xfs_log_recover.c:3493) xfs_log_mount (fs/xfs/xfs_log.c:618) xfs_mountfs (fs/xfs/xfs_mount.c:1034) xfs_fs_fill_super (fs/xfs/xfs_super.c:1938) vfs_get_tree (fs/super.c:1695) path_mount (fs/namespace.c:4161) __x64_sys_mount (fs/namespace.c:4367)

    Source: suse_csaf, Ubuntu Security Notices, HKCERT (CC BY 3.0 HK) · HKCERT rating: medium, Debian LTS Advisories, Debian Security Advisories, BSI WID Portal, BSI CSAF, ENISA EUVD, 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
    • 6.19 – < 7.1.4
    • 6.2 – < 6.6.145
    • 4.3 – < 5.15.212
    • 6.7 – < 6.12.96
    • —
    • 6.13 – < 6.18.39
    • 5.16 – < 6.1.178
    • 7.1.4
    • 6.6.145
    • 5.15.212
    • 6.12.96
    • 7.2
    • 6.18.39
    • 6.1.178

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxtrixie
    Linuxubuntulinuxnoble
    Linuxdebianlinux-6.1bullseye
    Linuxdebianlinux-6.12bookworm
    Linuxubuntulinux-awsnoble
    Linuxubuntulinux-aws-6.8jammy
    Linuxubuntulinux-aws-fipsnoble
    Linuxubuntulinux-azurenoble
    Linuxubuntulinux-azure-6.8jammy
    Linuxubuntulinux-azure-fdenoble
    Linuxubuntulinux-azure-fde-6.8jammy
    Linuxubuntulinux-azure-fipsnoble
    Linuxubuntulinux-fipsnoble
    Linuxubuntulinux-gcpnoble
    Linuxubuntulinux-gcp-6.8jammy
    Linuxubuntulinux-gcp-fipsnoble
    Linuxubuntulinux-gkenoble
    Linuxubuntulinux-gkeopnoble
    Linuxubuntulinux-hwe-6.8jammy
    Linuxubuntulinux-ibmnoble
    Linuxubuntulinux-ibm-6.8jammy
    Linuxubuntulinux-lowlatencynoble
    Linuxubuntulinux-lowlatency-hwe-6.8jammy

    References & sources

    • git.kernel.orgstable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55aPatch, euvd
    • git.kernel.orgstable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4Patch, euvd
    • git.kernel.orgstable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749Patch, euvd
    • git.kernel.orgstable/c/2094dab19d45c487285617b7b68913d0cc0c1211Patch, euvd
    • git.kernel.orgstable/c/5105426424ad6981db827cc1ada835a488fab035Patch, euvd
    • git.kernel.orgstable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4Patch, euvd
    • git.kernel.orgstable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96Patch, euvd

    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 21 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211
      Referenceadded
      —
      https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4
      Referenceadded
      —
      https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035
      Referenceadded
      —
      https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749
      Referenceadded
      —
      https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96
      Referenceadded
      —
      https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a
      Referenceadded
      —
      https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4
      Referenceremoved
      https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211
      —
      Referenceremoved
      https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4
      —
      Referenceremoved
      https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035
      —
      Referenceremoved
      https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4 Types: Patch
      —

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

    2. 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-2026-64187","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-11-06T16:31:54.393338Z"}

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

    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 6.1.178; 6.2 – before 6.6.145; 6.7 – before 6.12.96; 6.13 – before 6.18.39; 4.3 – before 5.15.212; 6.19 – before 7.1.4; 3 individual versions)

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

      Weakness type: CWE-476

      Show 10 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) 6.1.178 *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) 4.3 up to (excluding) 5.15.212 *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:7.2:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.2:rc3:*:*:*:*:*:*
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96 Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a Types: Patch
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4 Types: Patch

      Source identifier: nvd@nist.gov

    5. Record modifiedLinux

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4
      Referenceadded
      —
      https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035
      Referenceadded
      —
      https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96
      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: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none. The runtime commit path never emits such a transaction, so this only happens on a crafted log. It came from an AI-assisted code audit of the recovery parser. xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads *(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL ri_buf. Reject it there, before the commit handlers that also read ri_buf[0]. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836) xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043) xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501) xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244) xlog_recover (fs/xfs/xfs_log_recover.c:3493) xfs_log_mount (fs/xfs/xfs_log.c:618) xfs_mountfs (fs/xfs/xfs_mount.c:1034) xfs_fs_fill_super (fs/xfs/xfs_super.c:1938) vfs_get_tree (fs/super.c:1695) path_mount (fs/namespace.c:4161) __x64_sys_mount (fs/namespace.c:4367)
      Referenceadded
      —
      https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211
      Referenceadded
      —
      https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749
      Referenceadded
      —
      https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a
      Referenceadded
      —
      https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4

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

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