HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler()

{
  "id": "5e2b0ae01ab594c5067653a537d4bef1e0582726dfd0b3a5d47cbbb12ee50581",
  "url": "https://osv.dev/vulnerability/CVE-2026-80772",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler() joycon_ctlr_read_handler() casts an incoming HID input report to struct joycon_input_report and parses it, guarding the cast only with a 12-byte length check: if (size >= 12) /* make sure it contains the input report */ joycon_parse_report(ctlr, (struct joycon_input_report *)data); struct joycon_input_report is 49 bytes: a 13-byte header followed by a union whose IMU arm is 36 bytes. For an IMU report joycon_parse_report() -> joycon_parse_imu_report() walks that union (struct offsets 13..48), so a report of exactly 12 bytes with data[0] == JC_INPUT_IMU_DATA passes the guard yet is read up to 37 bytes past its declared length. The over-read bytes are decoded into accelerometer/gyroscope values and forwarded to userspace through the \"(IMU)\" input device, leaking driver-internal memory. data[0] and size are fully controlled by a malicious or spoofed Joy-Con/Pro Controller. Receive buffers are sized to the maximum report length, so this is an over-read within the allocation rather than a slab OOB, but the decoded bytes still reach userspace. The sibling subcmd path in joycon_ctlr_handle_event() already bounds the same cast correctly: if (size < sizeof(struct joycon_input_report) || data[0] != JC_INPUT_SUBCMD_REPLY) break; Use the same sizeof(struct joycon_input_report) bound here.",
    "evidence": "osv:CVE-2026-80772",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "6.6.154",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.1",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80772",
      "aliases": [
        "CVE-2026-80772"
      ],
      "affected": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:42.094511887Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/27b376b945c0aac46fcdfcc950b14a85b874b557",
        "https://git.kernel.org/stable/c/33ea29f8b6141f2d265de807e110a6435b355cb0",
        "https://git.kernel.org/stable/c/34725ed4719da424113db8449fb5485aaf71a913",
        "https://git.kernel.org/stable/c/51cfd1adbe7a46bb08af162abb3ab3b6820e2d15",
        "https://git.kernel.org/stable/c/addca61f9a23c0d20a387c2040e70479f54518e1",
        "https://git.kernel.org/stable/c/bd397c4123a4bc084913d8c7fdb40ef94e9f8172",
        "https://git.kernel.org/stable/c/d4cabd4089adb59cf7974915737c52cc47a9bb1b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80772.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80772",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80772.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-80772",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510057,
  "published_at": "2026-09-04T15:12:44.445+00:00"
}