CVE-2026-89621 (GCVE-0-2026-89621)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-19 08:49
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: validate report size in mcp2221_raw_event() mcp2221_raw_event() never validates the size of incoming HID reports. In the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3] as the copy length without checking that 4 + data[3] bytes actually exist in the received report. A malicious or misbehaving USB device can send a short report with a large data[3], causing the memcpy to read past the valid report data in the HID transfer buffer and leak uninitialized kernel memory back to userspace through the I2C/SMBus read path. Add a minimum size check at entry and validate that the source range fits within the received report before the copy.
References
Impacted products
Vendor Product Version
Linux Linux Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
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{
  "containers": {
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          "programFiles": [
            "drivers/hid/hid-mcp2221.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: validate report size in mcp2221_raw_event()\n\nmcp2221_raw_event() never validates the size of incoming HID reports.\nIn the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3]\nas the copy length without checking that 4 + data[3] bytes actually\nexist in the received report. A malicious or misbehaving USB device can\nsend a short report with a large data[3], causing the memcpy to read\npast the valid report data in the HID transfer buffer and leak\nuninitialized kernel memory back to userspace through the I2C/SMBus\nread path.\n\nAdd a minimum size check at entry and validate that the source range\nfits within the received report before the copy."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:53.686Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f"
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          "url": "https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079"
        }
      ],
      "title": "HID: mcp2221: validate report size in mcp2221_raw_event()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89621",
    "datePublished": "2026-09-11T19:45:19.420Z",
    "dateReserved": "2026-09-11T19:38:34.736Z",
    "dateUpdated": "2026-10-19T08:49:53.686Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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