CVE-2026-63958 (GCVE-0-2026-63958)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-07-20 06:41
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
Version: c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cea949203faef9cb783adc7b978cce056271e057",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            },
            {
              "lessThan": "156b6f0aec6108909b0c4aedc78865b12766b347",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            },
            {
              "lessThan": "bd24d92af4ae021b6209f28e9a57e1bf2260d4fd",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            },
            {
              "lessThan": "0edd1e21587b0483c7ceb993b9fb9668bbef7433",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            },
            {
              "lessThan": "5af2719b460ab904c504fc069d1dd2a3aa2b22b0",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            },
            {
              "lessThan": "288a81a8507052bcfbf884d39a463c44c42c5fd9",
              "status": "affected",
              "version": "c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cea949203faef9cb783adc7b978cce056271e057"
        },
        {
          "url": "https://git.kernel.org/stable/c/156b6f0aec6108909b0c4aedc78865b12766b347"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd24d92af4ae021b6209f28e9a57e1bf2260d4fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/0edd1e21587b0483c7ceb993b9fb9668bbef7433"
        },
        {
          "url": "https://git.kernel.org/stable/c/5af2719b460ab904c504fc069d1dd2a3aa2b22b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/288a81a8507052bcfbf884d39a463c44c42c5fd9"
        }
      ],
      "title": "usb: typec: ucsi: validate connector number in ucsi_connector_change()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.