CVE-2026-64277

Full vulnerability record from the local CVENow database.

Description

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.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Modified

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-07-25 10:17:08.197000

Last modified

2026-10-24 13:10:00.147000

View original CVE JSON

{
  "id": "CVE-2026-64277",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:08.197",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: synaptics-rmi4 - bound the F3A keymap to the GPIO count\n\nrmi_f3a_initialize() takes the GPIO count from the device query register\n(f3a->gpio_count = buf & RMI_F3A_GPIO_COUNT, range 0..127).\nrmi_f3a_map_gpios() then allocates gpio_key_map with\nmin(gpio_count, TRACKSTICK_RANGE_END) == at most 6 entries, but\nrmi_f3a_attention() iterates the full gpio_count and dereferences\ngpio_key_map[i], and input->keycodemax is set to the full gpio_count\nwhile input->keycode points at the 6-entry allocation.\n\nA device that reports gpio_count > 6 therefore causes an out-of-bounds\nread of gpio_key_map[] on every attention interrupt, and out-of-bounds\naccesses through the input core's default keymap ioctls: EVIOCGKEYCODE\nreads past the buffer (leaking adjacent slab memory to user space) and\nEVIOCSKEYCODE writes a caller-controlled value past it, for any process\nable to open the evdev node, since input_default_getkeycode() and\ninput_default_setkeycode() only bound the index against keycodemax.\n\nSize the keymap for the full gpio_count. The mapping loop is unchanged:\nit still assigns only the first min(gpio_count, TRACKSTICK_RANGE_END)\nentries; the remaining slots stay KEY_RESERVED (devm_kcalloc zero-fills)\nand are skipped when reporting."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nInput: synaptics-rmi4 - vinculó el mapa de teclas F3A al recuento de GPIO\n\nrmi_f3a_initialize() toma el recuento de GPIO del registro de consulta del dispositivo (f3a  ->  gpio_count = buf & RMI_F3A_GPIO_COUNT, rango 0..127).\nrmi_f3a_map_gpios() luego asigna gpio_key_map con min(gpio_count, TRACKSTICK_RANGE_END) == como máximo 6 entradas, pero rmi_f3a_attention() itera el gpio_count completo y desreferencia gpio_key_map[i], y input  ->  keycodemax se establece en el gpio_count completo mientras que input  ->  keycode apunta a la asignación de 6 entradas.\n\nUn dispositivo que reporta gpio_count > 6, por lo tanto, causa una lectura fuera de límites de gpio_key_map[] en cada interrupción de atención, y accesos fuera de límites a través de los ioctls del mapa de teclas predeterminado del núcleo de entrada: EVIOCGKEYCODE lee más allá del búfer (filtrando memoria slab adyacente al espacio de usuario) y EVIOCSKEYCODE escribe un valor controlado por el llamador más allá de él, para cualquier proceso capaz de abrir el nodo evdev, ya que input_default_getkeycode() y input_default_setkeycode() solo vincularon el índice contra keycodemax.\n\nDimensionar el mapa de teclas para el gpio_count completo. El bucle de mapeo no ha cambiado: todavía asigna solo las primeras min(gpio_count, TRACKSTICK_RANGE_END) entradas; las ranuras restantes permanecen KEY_RESERVED (devm_kcalloc rellena con ceros) y se omiten al informar."
    }
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
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          "availabilityImpact": "HIGH"
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          "options": [
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            },
            {
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              "technicalImpact": "total"
            }
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          "role": "CISA Coordinator",
          "version": "2.0.3"
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "CWE-125"
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