FKIE_CVE-2026-64277

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-30 15:00
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/rmi4/rmi_f3a.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "502ad7caaa1a445b734c827fa256e5311df67e3d",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "3480e24bc4e178aaa009edb25b6ee12df199e210",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "35ed74d32d8260bdfb14a94caf402bf0866bdeec",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "ba57f430328534501962d60d651e385ffd7af9ca",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "850117b637bcb1dcc14be0cf09ac819a8707b42c",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "8db211aed83733073b0814adaeeab61d4521474e",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            },
            {
              "lessThan": "57c10915f2c16c90e0d46ad00876bf39ece40fc2",
              "status": "affected",
              "version": "9e4c596bfd004f447a652205163234dfd4aafa69",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/rmi4/rmi_f3a.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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-\u003egpio_count = buf \u0026 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-\u003ekeycodemax is set to the full gpio_count\nwhile input-\u003ekeycode points at the 6-entry allocation.\n\nA device that reports gpio_count \u003e 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\u0027s 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."
    }
  ],
  "id": "CVE-2026-64277",
  "lastModified": "2026-07-30T15:00:27.343",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-25T10:17:08.197",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3480e24bc4e178aaa009edb25b6ee12df199e210"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/35ed74d32d8260bdfb14a94caf402bf0866bdeec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/502ad7caaa1a445b734c827fa256e5311df67e3d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57c10915f2c16c90e0d46ad00876bf39ece40fc2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64fb0e1161ccc6b9e48b8df61f07d3c34c01ec42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/850117b637bcb1dcc14be0cf09ac819a8707b42c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8db211aed83733073b0814adaeeab61d4521474e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ba57f430328534501962d60d651e385ffd7af9ca"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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