HID: picolcd: clamp eeprom debugfs read to bytes actually received

{
  "id": "9de91c2b957c825fe513381cd126cda9d08c879af70e9a2e9af9c51ca991a9a4",
  "url": "https://osv.dev/vulnerability/CVE-2026-89628",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HID: picolcd: clamp eeprom debugfs read to bytes actually received",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: HID: picolcd: clamp eeprom debugfs read to bytes actually received picolcd_debug_eeprom_read() trusts resp->raw_data[2] -- a length byte supplied by the device in its REPORT_EE_DATA reply -- clamped only to the caller's read() count: ret = resp->raw_data[2]; if (ret > s) ret = s; if (copy_to_user(u, resp->raw_data+3, ret)) It never checks resp->raw_size, the number of bytes picolcd_raw_event() actually copied into the 64-byte raw_data[] of the kmalloc'd struct picolcd_pending. A device (or a spoofed picoLCD) returning a length byte of 0xff, read with a count >= 255, makes copy_to_user() read past raw_data[] into adjacent slab memory and return it to userspace through the debugfs \"eeprom\" file: BUG: KASAN: slab-out-of-bounds in _copy_to_user Read of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd] The debug-dump path in the same file already validates the device length byte against the received size before trusting it; this read does not. The file is created S_IRUSR (root-only) and a crafted device is needed, so it is neither unprivileged- nor remotely-triggerable. Clamp the copy length to resp->raw_size - 3 (the payload actually received, minus the 3-byte header), floored at 0 for short replies.",
    "evidence": "osv:CVE-2026-89628",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89628",
      "aliases": [
        "CVE-2026-89628"
      ],
      "affected": [
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                  "fixed": "1a02056c2bf7ef9b5fd05ee6913aeeadb703c443"
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                {
                  "fixed": "65daa322f1021d8206f8032c4cd4c0cb2d26c7c3"
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                {
                  "fixed": "8dc662af019158690c470edd2e2857657f700abb"
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                  "fixed": "4daf432c94a42e7be6aa10b012b33af5ed9bc118"
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                  "fixed": "a3e6e8d7198a9f3861861520a38b673684a1062b"
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              "type": "ECOSYSTEM",
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                  "introduced": "2.6.35"
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                {
                  "fixed": "5.10.270"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:31.582831039Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1a02056c2bf7ef9b5fd05ee6913aeeadb703c443",
        "https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098",
        "https://git.kernel.org/stable/c/4daf432c94a42e7be6aa10b012b33af5ed9bc118",
        "https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3",
        "https://git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84",
        "https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb",
        "https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b",
        "https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89628.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89628",
        "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/2026/89xxx/CVE-2026-89628.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89628",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498704,
  "published_at": "2026-09-11T19:45:24.203+00:00"
}