fkie_cve-2025-21689
Vulnerability from fkie_nvd
Published
2025-02-10 16:15
Modified
2025-11-03 21:19
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fadePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13


To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: USB: serial: quatech2: arreglo de null-ptr-deref en qt2_process_read_urb() Este parche soluciona un null-ptr-deref en qt2_process_read_urb() debido a una comprobaci\u00f3n de los l\u00edmites incorrecta en lo siguiente: if (newport \u0026gt; serial-\u0026gt;num_ports) { dev_err(\u0026amp;port-\u0026gt;dev, \"%s - port change to invalid port: %i\\n\", __func__, newport); break; } La condici\u00f3n no tiene en cuenta el rango v\u00e1lido del b\u00fafer serial-\u0026gt;port, que es de 0 a serial-\u0026gt;num_ports - 1. Cuando newport es igual a serial-\u0026gt;num_ports, la asignaci\u00f3n de \"port\" en el siguiente c\u00f3digo est\u00e1 fuera de los l\u00edmites y es NULL: serial_priv-\u0026gt;current_port = newport; port = serial-\u0026gt;port[serial_priv-\u0026gt;current_port]; La soluci\u00f3n verifica si newport es mayor o igual que serial-\u0026gt;num_ports, lo que indica que est\u00e1 fuera de los l\u00edmites."
    }
  ],
  "id": "CVE-2025-21689",
  "lastModified": "2025-11-03T21:19:08.123",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "source": "nvd@nist.gov",
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          "baseScore": 5.5,
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          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  "published": "2025-02-10T16:15:38.447",
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  "vulnStatus": "Modified",
  "weaknesses": [
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}


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