CriticalCVE-2026-64303

    Linux Kernel: Use After Free (CVE-2026-64303)

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

    Share

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path When dmaengine_prep_slave_sg() fails for the TX channel, the error path terminates the TX DMA channel but leaves the RX channel running. Since the RX channel was already submitted and issued prior to preparing the TX descriptor, returning -EINVAL causes the SPI core to unmap the DMA buffers while the RX DMA engine continues writing to them, leading to potential memory corruption or use-after-free.

    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 5.2..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..6.12.96
    • Linux Kernel lt 6.13..6.18.39
    • Linux Kernel lt 6.19..7.1.4
    Fixed in
    • Linux Kernel 5.10.261
    • Linux Kernel 5.15.212
    • Linux Kernel 6.1.178
    • Linux Kernel 6.6.145
    • Linux Kernel 6.12.96
    • 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

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

    0.7 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 53.1

    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
    92.43 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
    0.7 %
    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
    53.1
    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
    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

    In the Linux kernel, the following vulnerability has been resolved: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path When dmaengine_prep_slave_sg() fails for the TX channel, the error path terminates the TX DMA channel but leaves the RX channel running. Since the RX channel was already submitted and issued prior to preparing the TX descriptor, returning -EINVAL causes the SPI core to unmap the DMA buffers while the RX DMA engine continues writing to them, leading to potential memory corruption or use-after-free. Terminate the RX channel before returning on the TX prepare failure path.

    Source: suse_csaf, HKCERT (CC BY 3.0 HK) · HKCERT rating: medium, Ubuntu Security Notices, NVD (NIST), cvelistv5, Microsoft Security Update Guide, Debian LTS Advisories, 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
    • 5.11 – < 5.15.212
    • 6.19 – < 7.1.4
    • 6.2 – < 6.6.145
    • 6.7 – < 6.12.96
    • —
    • 6.13 – < 6.18.39
    • 5.2 – < 5.10.261
    • 5.16 – < 6.1.178
    • 5.15.212
    • 7.1.4
    • 6.6.145
    • 6.12.96
    • 7.2
    • 6.18.39
    • 5.10.261
    • 6.1.178

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbookworm
    Linuxdebianlinuxbullseye
    Linuxubuntulinuxnoble
    Linuxdebianlinux-6.1bullseye
    Linuxdebianlinux-6.12bookworm
    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_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

    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/01980b5da56e573d62798d0ff6c86bcaa2b22cbe
      Referenceadded
      —
      https://git.kernel.org/stable/c/808033d80d5c9f8adf7e8de9317389270ce13430
      Referenceadded
      —
      https://git.kernel.org/stable/c/9d000bdd250d649a11cd7f733175686877344582
      Referenceadded
      —
      https://git.kernel.org/stable/c/ad370d1c7a9a832f77b2341513cd31188c9443af
      Referenceadded
      —
      https://git.kernel.org/stable/c/af39a2698f69b584d14a00cffe0f51a2caa15337
      Referenceadded
      —
      https://git.kernel.org/stable/c/cce2063404b2341e7b2bbf85eddfcd70a31a0033
      Referenceadded
      —
      https://git.kernel.org/stable/c/d5c1060218a3749c8a18b36f8169d910fce20639
      Referenceadded
      —
      https://git.kernel.org/stable/c/e65505d91fa036a238968e4c10744244d1b968c4
      Referenceremoved
      https://git.kernel.org/stable/c/01980b5da56e573d62798d0ff6c86bcaa2b22cbe
      —
      Referenceremoved
      https://git.kernel.org/stable/c/808033d80d5c9f8adf7e8de9317389270ce13430
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9d000bdd250d649a11cd7f733175686877344582
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ad370d1c7a9a832f77b2341513cd31188c9443af
      —
      Referenceremoved
      https://git.kernel.org/stable/c/af39a2698f69b584d14a00cffe0f51a2caa15337
      —
      Referenceremoved
      https://git.kernel.org/stable/c/cce2063404b2341e7b2bbf85eddfcd70a31a0033
      —
      Referenceremoved
      https://git.kernel.org/stable/c/d5c1060218a3749c8a18b36f8169d910fce20639
      —
      Referenceremoved
      https://git.kernel.org/stable/c/e65505d91fa036a238968e4c10744244d1b968c4
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/01980b5da56e573d62798d0ff6c86bcaa2b22cbe Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/808033d80d5c9f8adf7e8de9317389270ce13430 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/9d000bdd250d649a11cd7f733175686877344582 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ad370d1c7a9a832f77b2341513cd31188c9443af Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/af39a2698f69b584d14a00cffe0f51a2caa15337 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/cce2063404b2341e7b2bbf85eddfcd70a31a0033 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d5c1060218a3749c8a18b36f8169d910fce20639 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/e65505d91fa036a238968e4c10744244d1b968c4 Types: Patch
      —

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

    3. 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-2026-64303","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:38:43.370379Z"}

      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. 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: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path When dmaengine_prep_slave_sg() fails for the TX channel, the error path terminates the TX DMA channel but leaves the RX channel running. Since the RX channel was already submitted and issued prior to preparing the TX descriptor, returning -EINVAL causes the SPI core to unmap the DMA buffers while the RX DMA engine continues writing to them, leading to potential memory corruption or use-after-free. Terminate the RX channel before returning on the TX prepare failure path.
      Referenceadded
      —
      https://git.kernel.org/stable/c/01980b5da56e573d62798d0ff6c86bcaa2b22cbe
      Referenceadded
      —
      https://git.kernel.org/stable/c/808033d80d5c9f8adf7e8de9317389270ce13430
      Referenceadded
      —
      https://git.kernel.org/stable/c/9d000bdd250d649a11cd7f733175686877344582
      Referenceadded
      —
      https://git.kernel.org/stable/c/ad370d1c7a9a832f77b2341513cd31188c9443af
      Referenceadded
      —
      https://git.kernel.org/stable/c/af39a2698f69b584d14a00cffe0f51a2caa15337
      Referenceadded
      —
      https://git.kernel.org/stable/c/cce2063404b2341e7b2bbf85eddfcd70a31a0033
      Referenceadded
      —
      https://git.kernel.org/stable/c/d5c1060218a3749c8a18b36f8169d910fce20639
      Referenceadded
      —
      https://git.kernel.org/stable/c/e65505d91fa036a238968e4c10744244d1b968c4

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

    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-2026-64303
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-64303"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-64303.svg?lang=en" alt="CVE-2026-64303 – NEOSEC Intel" height="20"></a>