ghsa-mgqg-wqxj-q43c
Vulnerability from github
Published
2025-02-10 18:30
Modified
2025-11-03 21:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following:

   if (newport > serial->num_ports) {
           dev_err(&port->dev,
                   "%s - port change to invalid port: %i\n",
                   __func__, newport);
           break;
   }

The condition doesn't account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of "port" in the following code is out-of-bounds and NULL:

   serial_priv->current_port = newport;
   port = serial->port[serial_priv->current_port];

The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21689"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-10T16:15:38Z",
    "severity": "MODERATE"
  },
  "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 \u003e serial-\u003enum_ports) {\n               dev_err(\u0026port-\u003edev,\n                       \"%s - port change to invalid port: %i\\n\",\n                       __func__, newport);\n               break;\n       }\n\nThe condition doesn\u0027t account for the valid range of the serial-\u003eport\nbuffer, which is from 0 to serial-\u003enum_ports - 1. When newport is equal\nto serial-\u003enum_ports, the assignment of \"port\" in the\nfollowing code is out-of-bounds and NULL:\n\n       serial_priv-\u003ecurrent_port = newport;\n       port = serial-\u003eport[serial_priv-\u003ecurrent_port];\n\nThe fix checks if newport is greater than or equal to serial-\u003enum_ports\nindicating it is out-of-bounds.",
  "id": "GHSA-mgqg-wqxj-q43c",
  "modified": "2025-11-03T21:32:41Z",
  "published": "2025-02-10T18:30:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21689"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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