CVE-2026-63958 (GCVE-0-2026-63958)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 06:41
VLAI
Title
usb: typec: ucsi: validate connector number in ucsi_connector_change()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_connector_change() The connector number in a UCSI CCI notification is a 7-bit field supplied by the PPM. ucsi_connector_change() uses it to index the ucsi->connector[] array without checking it against the number of connectors the PPM reported at init time, so a buggy or malicious PPM (EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 / glink transports) can drive schedule_work() on memory past the end of the array. Reject connector numbers that are zero or exceed cap.num_connectors before dereferencing the array.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < cea949203faef9cb783adc7b978cce056271e057 (git)
Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < 156b6f0aec6108909b0c4aedc78865b12766b347 (git)
Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < bd24d92af4ae021b6209f28e9a57e1bf2260d4fd (git)
Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < 0edd1e21587b0483c7ceb993b9fb9668bbef7433 (git)
Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < 5af2719b460ab904c504fc069d1dd2a3aa2b22b0 (git)
Affected: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f , < 288a81a8507052bcfbf884d39a463c44c42c5fd9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "programFiles": [
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              "version": "6.12.93",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
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              "version": "7.0.12",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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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_connector_change()\n\nThe connector number in a UCSI CCI notification is a 7-bit field\nsupplied by the PPM.  ucsi_connector_change() uses it to index the\nucsi-\u003econnector[] array without checking it against the number of\nconnectors the PPM reported at init time, so a buggy or malicious PPM\n(EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 /\nglink transports) can drive schedule_work() on memory past the end of\nthe array.\n\nReject connector numbers that are zero or exceed cap.num_connectors\nbefore dereferencing the array."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T06:41:38.075Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/288a81a8507052bcfbf884d39a463c44c42c5fd9"
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    "cveId": "CVE-2026-63958",
    "datePublished": "2026-07-19T14:55:48.835Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-20T06:41:38.075Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-21",
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      "percentile": "0.11701"
    },
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: typec: ucsi: validate connector number in ucsi_connector_change()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63958.json",
      "version": "2"
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        "cveTags": [],
        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_connector_change()\n\nThe connector number in a UCSI CCI notification is a 7-bit field\nsupplied by the PPM.  ucsi_connector_change() uses it to index the\nucsi-\u003econnector[] array without checking it against the number of\nconnectors the PPM reported at init time, so a buggy or malicious PPM\n(EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 /\nglink transports) can drive schedule_work() on memory past the end of\nthe array.\n\nReject connector numbers that are zero or exceed cap.num_connectors\nbefore dereferencing the array."
          }
        ],
        "id": "CVE-2026-63958",
        "lastModified": "2026-07-30T14:51:11.223",
        "metrics": {},
        "published": "2026-07-19T16:17:14.667",
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    "redhat_vex": {
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      "current_release_date": "2026-08-07T13:49:30+00:00",
      "cve": "CVE-2026-63958",
      "id": "CVE-2026-63958",
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      "product_status:known_affected": "260",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: usb: typec: ucsi: validate connector number in ucsi_connector_change()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63958.json",
      "version": "3"
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      "current_release_date": "2026-09-16T00:08:43Z",
      "cve": "CVE-2026-63958",
      "id": "CVE-2026-63958",
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      "product_status:first_fixed": "2",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-63958",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63958.json",
      "version": "12"
    }
  }
}



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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

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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.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.