CVE-2025-21689 (GCVE-0-2025-21689)

Vulnerability from cvelistv5 – Published: 2025-02-10 15:58 – Updated: 2026-05-11 21:04
VLAI
Title
USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:51 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < fa4c7472469d97c4707698b4c0e098f8cfc2bf22 (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 94770cf7c5124f0268d481886829dc2beecc4507 (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 4b9b41fabcd38990f69ef0cee9c631d954a2b530 (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 6377838560c03b36e1153a42ef727533def9b68f (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < f371471708c7d997f763b0e70565026eb67cc470 (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 8542b33622571f54dfc2a267fce378b6e3840b8b (git)
Affected: f7a33e608d9ae022b7f49307921627e34e9484ed , < 575a5adf48b06a2980c9eeffedf699ed5534fade (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.4.290 , ≤ 5.4.* (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.178 , ≤ 5.15.* (semver)
Unaffected: 6.1.128 , ≤ 6.1.* (semver)
Unaffected: 6.6.75 , ≤ 6.6.* (semver)
Unaffected: 6.12.12 , ≤ 6.12.* (semver)
Unaffected: 6.13.1 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "cveTags": [],
        "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": "2026-06-17T08:44:01.713",
        "metrics": {
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              "cvssData": {
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21689.json",
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2025-21689",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-21689.json",
      "version": "68"
    },
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            "title": "CVE Program Container"
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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                      "vulnerable": true
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                    {
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            {
              "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."
            }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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              "url": "https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507"
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            },
            {
              "url": "https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade"
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          ],
          "title": "USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()",
          "x_generator": {
            "engine": "bippy-1.2.0"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2025-21689",
        "datePublished": "2025-02-10T15:58:45.493Z",
        "dateReserved": "2024-12-29T08:45:45.741Z",
        "dateUpdated": "2025-11-03T20:59:10.756Z",
        "state": "PUBLISHED"
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    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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