Input: goodix - clamp the device-reported contact count

{
  "id": "26b46f252b1dbdeab2b415fbc759ef8bf416762f901d9b4239d09bd111d8ec2e",
  "url": "https://osv.dev/vulnerability/CVE-2026-64274",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Input: goodix - clamp the device-reported contact count",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Input: goodix - clamp the device-reported contact count goodix_ts_read_input_report() copies the number of touch points reported by the device into an on-stack buffer u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; which is sized for at most GOODIX_MAX_CONTACTS (10) contacts. The only runtime check bounds the per-interrupt count against ts->max_touch_num, but that value is taken verbatim from a 4-bit field of the device configuration block and is never clamped: ts->max_touch_num = ts->config[MAX_CONTACTS_LOC] & 0x0f; The nibble can be 0..15, so a malfunctioning, malicious or counterfeit controller (or an attacker tampering with the I2C bus) can advertise up to 15 contacts. goodix_ts_read_input_report() then accepts a touch_num of up to 15 and the second goodix_i2c_read() writes ts->contact_size * (touch_num - 1) bytes past the one-contact header into point_data - up to 30 bytes (45 with the 9-byte report format) beyond the 92-byte buffer: a stack out-of-bounds write. Clamp max_touch_num to GOODIX_MAX_CONTACTS, the number of contacts point_data[] is sized for, when reading it from the configuration.",
    "evidence": "osv:CVE-2026-64274",
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      "modified": "2026-10-28T02:30:35.845442130Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2a67668690129953e898923260a2dd1c7c196495",
        "https://git.kernel.org/stable/c/3b32303460155603d25444274856013d211d5e1f",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64274.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64274",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
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  "source_id": "core-osv",
  "document_id": 503423,
  "published_at": "2026-07-25T08:49:20.04+00:00"
}