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

Vulnerability from cvelistv5 – Published: 2025-02-10 15:58 – Updated: 2025-11-03 20:59
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
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
    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)
Create a notification for this product.
Show details on NVD website
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\"https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f\"}, {\"url\": \"https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470\"}, {\"url\": \"https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b\"}, {\"url\": \"https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.290\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.178\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.128\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.75\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.12\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.1\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"3.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:19:05.956Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21689\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T20:59:10.756Z\", \"dateReserved\": \"2024-12-29T08:45:45.741Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-10T15:58:45.493Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.