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CVE-2026-89620

Estado: RecibidaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

HID: intel-thc-hid: intel-quickspi: validate report size before copy

write_cmd_to_txdma() builds an output report in qsdev->report_buf, a heap buffer allocated in quickspi_alloc_report_buf() to the device-descriptor derived max_report_len (a few hundred bytes for a touch controller). It copies the caller-supplied report into that buffer:

The HID core caps a report at HID_MAX_BUFFER_SIZE (16384) by default, and quickspi_hid_ll_driver does not set max_buffer_size, so the length reaches the driver unbounded. A hidraw SET_REPORT/SET_FEATURE ioctl carrying a report larger than max_report_len therefore overflows report_buf with attacker-controlled length and content.

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Record the report_buf allocation size and reject reports that do not fit before copying, matching the equivalent guard in the intel-quicki2c sibling (quicki2c_init_write_buf()) and the hid-goodix-spi fix.

write_cmd_to_txdma() writes the output report header ahead of the content in the same buffer, so size the allocation to cover the header as well. That keeps the added bound from rejecting a maximum-sized report.

Detalles técnicos trazas, registros y código del informe original
    memcpy(write_buf->content, report_buf, report_buf_len);

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:L/PR:L sin UI permite escalada local; memcpy sin límites en kernel permite ejecución de código arbitrario y corrupción de memoria de kernel con privilegios elevados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-89620",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "9d8d51735a3af40b722346931a6a1e50227df4b5",
              "lessThan": "6fcefe71aeb524f6e77fe586fe85d873745e917c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9d8d51735a3af40b722346931a6a1e50227df4b5",
              "lessThan": "ee8ad1bb1e96164d51089b1182f1bd5f187e7baa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9d8d51735a3af40b722346931a6a1e50227df4b5",
              "lessThan": "a59cf84441f9a17323c89452cec2bf16724c48a9",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c",
            "drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h",
            "drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c",
            "drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h",
            "drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:47.280",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6fcefe71aeb524f6e77fe586fe85d873745e917c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a59cf84441f9a17323c89452cec2bf16724c48a9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee8ad1bb1e96164d51089b1182f1bd5f187e7baa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: intel-thc-hid: intel-quickspi: validate report size before copy\n\nwrite_cmd_to_txdma() builds an output report in qsdev->report_buf, a heap\nbuffer allocated in quickspi_alloc_report_buf() to the device-descriptor\nderived max_report_len (a few hundred bytes for a touch controller).  It\ncopies the caller-supplied report into that buffer:\n\n    memcpy(write_buf->content, report_buf, report_buf_len);\n\nThe HID core caps a report at HID_MAX_BUFFER_SIZE (16384) by default, and\nquickspi_hid_ll_driver does not set max_buffer_size, so the length reaches\nthe driver unbounded.  A hidraw SET_REPORT/SET_FEATURE ioctl carrying a\nreport larger than max_report_len therefore overflows report_buf with\nattacker-controlled length and content.\n\nRecord the report_buf allocation size and reject reports that do not fit\nbefore copying, matching the equivalent guard in the intel-quicki2c\nsibling (quicki2c_init_write_buf()) and the hid-goodix-spi fix.\n\nwrite_cmd_to_txdma() writes the output report header ahead of the content\nin the same buffer, so size the allocation to cover the header as well.\nThat keeps the added bound from rejecting a maximum-sized report."
    }
  ],
  "lastModified": "2026-09-13T07:17:27.557",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}