HighCVE-2026-64277

    Linux Kernel: Out-of-bounds Read (CVE-2026-64277)

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

    What is affected, what to do

    A flaw was found in the Linux kernel's `synaptics-rmi4` input driver. The `rmi_f3a_map_gpios()` function incorrectly allocates memory for the `gpio_key_map`, making it smaller than required.

    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 5.10..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

    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, BSI, CVE.org, Msrc Update Guide

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 6.3

    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
    60.54 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
    0.2 %
    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
    6.3
    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-125, CWE-787

    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 `synaptics-rmi4` input driver. The `rmi_f3a_map_gpios()` function incorrectly allocates memory for the `gpio_key_map`, making it smaller than required. This allows a device reporting a specific `gpio_count` value to trigger an out-of-bounds read, leading to information disclosure by leaking adjacent slab memory to user space. Additionally, a local user with access to the `evdev` node can exploit this vulnerability to perform out-of-bounds writes with caller-controlled values, which may lead to further system compromise.

    Source: suse_csaf, Ubuntu Security Notices, redhat_csaf, Debian LTS Advisories, BSI WID Portal, BSI CSAF, NVD (NIST), cvelistv5, Microsoft Security Update Guide

    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
    • 5.10 – < 5.10.261
    • 6.2 – < 6.6.145
    • 6.7 – < 6.12.96
    • —
    • 6.13 – < 6.18.39
    • 5.16 – < 6.1.178
    • 5.15.212
    • 7.1.4
    • 5.10.261
    • 6.6.145
    • 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
    Linuxdebianlinux-6.1bullseye
    Linuxdebianlinux-6.12bookworm
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-125Out-of-bounds Read

      Base

      The product reads data past the end, or before the beginning, of the intended buffer.

      Entry at MITRE CWE-125

    • CWE-787Out-of-bounds Write

      Base

      The product writes data past the end, or before the beginning, of the intended buffer.

      Entry at MITRE CWE-787

    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-787

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-787

      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/3480e24bc4e178aaa009edb25b6ee12df199e210
      Referenceadded
      —
      https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec
      Referenceadded
      —
      https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d
      Referenceadded
      —
      https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2
      Referenceadded
      —
      https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42
      Referenceadded
      —
      https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c
      Referenceadded
      —
      https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e
      Referenceadded
      —
      https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca
      Referenceremoved
      https://git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210
      —
      Referenceremoved
      https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec
      —
      Referenceremoved
      https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2
      —
      Referenceremoved
      https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42
      —
      Referenceremoved
      https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c
      —
      Referenceremoved
      https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca 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-2026-64277","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:38:13.158819Z"}

      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: Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count rmi_f3a_initialize() takes the GPIO count from the device query register (f3a->gpio_count = buf & RMI_F3A_GPIO_COUNT, range 0..127). rmi_f3a_map_gpios() then allocates gpio_key_map with min(gpio_count, TRACKSTICK_RANGE_END) == at most 6 entries, but rmi_f3a_attention() iterates the full gpio_count and dereferences gpio_key_map[i], and input->keycodemax is set to the full gpio_count while input->keycode points at the 6-entry allocation. A device that reports gpio_count > 6 therefore causes an out-of-bounds read of gpio_key_map[] on every attention interrupt, and out-of-bounds accesses through the input core's default keymap ioctls: EVIOCGKEYCODE reads past the buffer (leaking adjacent slab memory to user space) and EVIOCSKEYCODE writes a caller-controlled value past it, for any process able to open the evdev node, since input_default_getkeycode() and input_default_setkeycode() only bound the index against keycodemax. Size the keymap for the full gpio_count. The mapping loop is unchanged: it still assigns only the first min(gpio_count, TRACKSTICK_RANGE_END) entries; the remaining slots stay KEY_RESERVED (devm_kcalloc zero-fills) and are skipped when reporting.
      Referenceadded
      —
      https://git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210
      Referenceadded
      —
      https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec
      Referenceadded
      —
      https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d
      Referenceadded
      —
      https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2
      Referenceadded
      —
      https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42
      Referenceadded
      —
      https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c
      Referenceadded
      —
      https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e
      Referenceadded
      —
      https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca

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

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