{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21689",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21689"
  ],
  "published": "2025-02-10T16:00:58Z",
  "summary": "USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()\n\nThis patch addresses a null-ptr-deref in qt2_process_read_urb() due to\nan incorrect bounds check in the following:\n\n       if (newport > serial->num_ports) {\n               dev_err(&port->dev,\n                       \"%s - port change to invalid port: %i\\n\",\n                       __func__, newport);\n               break;\n       }\n\nThe condition doesn't account for the valid range of the serial->port\nbuffer, which is from 0 to serial->num_ports - 1. When newport is equal\nto serial->num_ports, the assignment of \"port\" in the\nfollowing code is out-of-bounds and NULL:\n\n       serial_priv->current_port = newport;\n       port = serial->port[serial_priv->current_port];\n\nThe fix checks if newport is greater than or equal to serial->num_ports\nindicating it is out-of-bounds.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21689"
    },
    {
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}