CVE-2026-31729 (GCVE-0-2026-31729)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-01 14:14
VLAI?
Title
usb: typec: ucsi: validate connector number in ucsi_notify_common()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < f6dcbf2b024d55549959402f1db6c614e51d52cb (git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < f4e608fe12b7ac6a4a57176ab0296bb5a110a078 (git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0 (git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < d2d8c17ac01a1b1f638ea5d340a884ccc5015186 (git)
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    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
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          ],
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          "vendor": "Linux",
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              "version": "6.19.12",
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              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_notify_common()\n\nThe connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a\n7-bit field (0-127) that is used to index into the connector array in\nucsi_connector_change(). However, the array is only allocated for the\nnumber of connectors reported by the device (typically 2-4 entries).\n\nA malicious or malfunctioning device could report an out-of-range\nconnector number in the CCI, causing an out-of-bounds array access in\nucsi_connector_change().\n\nAdd a bounds check in ucsi_notify_common(), the central point where CCI\nis parsed after arriving from hardware, so that bogus connector numbers\nare rejected before they propagate further."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-01T14:14:28.868Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186"
        }
      ],
      "title": "usb: typec: ucsi: validate connector number in ucsi_notify_common()",
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31729",
    "datePublished": "2026-05-01T14:14:28.868Z",
    "dateReserved": "2026-03-09T15:48:24.134Z",
    "dateUpdated": "2026-05-01T14:14:28.868Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31729",
      "date": "2026-05-06",
      "epss": "0.00018",
      "percentile": "0.04643"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31729\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-01T15:16:35.467\",\"lastModified\":\"2026-05-01T15:24:14.893\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: typec: ucsi: validate connector number in ucsi_notify_common()\\n\\nThe connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a\\n7-bit field (0-127) that is used to index into the connector array in\\nucsi_connector_change(). However, the array is only allocated for the\\nnumber of connectors reported by the device (typically 2-4 entries).\\n\\nA malicious or malfunctioning device could report an out-of-range\\nconnector number in the CCI, causing an out-of-bounds array access in\\nucsi_connector_change().\\n\\nAdd a bounds check in ucsi_notify_common(), the central point where CCI\\nis parsed after arriving from hardware, so that bogus connector numbers\\nare rejected before they propagate further.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.