CVE-2026-63959 (GCVE-0-2026-63959)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 06:41
VLAI
Title
usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT A broken/malicious port can transmit a CRC-valid frame whose header advertises up to seven data objects but whose body carries fewer than that. Check for this, and rightfully reject the message, instead of reading from uninitialized stack memory.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6f413b559f86a2894188e082e389ff95ee428345 , < 0af00f1459f5dd757f0d392f8caa38039561ac62 (git)
Affected: 6f413b559f86a2894188e082e389ff95ee428345 , < dc17721d42e6d89f63572e63add8306a0e15eb3c (git)
Affected: 6f413b559f86a2894188e082e389ff95ee428345 , < 9b496e3371c04f0a03b7faa5d2442536d00e3998 (git)
Affected: 6f413b559f86a2894188e082e389ff95ee428345 , < c4ab8e2d4432abb646c5c0687f8dab173da901f9 (git)
Affected: 6f413b559f86a2894188e082e389ff95ee428345 , < aa2f716327be1818e1cb156da8a2844804aaec2f (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (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)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/tcpci_maxim_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "6f413b559f86a2894188e082e389ff95ee428345",
              "versionType": "git"
            },
            {
              "lessThan": "dc17721d42e6d89f63572e63add8306a0e15eb3c",
              "status": "affected",
              "version": "6f413b559f86a2894188e082e389ff95ee428345",
              "versionType": "git"
            },
            {
              "lessThan": "9b496e3371c04f0a03b7faa5d2442536d00e3998",
              "status": "affected",
              "version": "6f413b559f86a2894188e082e389ff95ee428345",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/tcpm/tcpci_maxim_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "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": "6.6.143",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT\n\nA broken/malicious port can transmit a CRC-valid frame whose header\nadvertises up to seven data objects but whose body carries fewer than\nthat.  Check for this, and rightfully reject the message, instead of\nreading from uninitialized stack memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T06:41:39.202Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0af00f1459f5dd757f0d392f8caa38039561ac62"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc17721d42e6d89f63572e63add8306a0e15eb3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b496e3371c04f0a03b7faa5d2442536d00e3998"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4ab8e2d4432abb646c5c0687f8dab173da901f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa2f716327be1818e1cb156da8a2844804aaec2f"
        }
      ],
      "title": "usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63959",
    "datePublished": "2026-07-19T14:55:49.553Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-20T06:41:39.202Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63959",
      "date": "2026-07-21",
      "epss": "0.002",
      "percentile": "0.10013"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-21T01:02:06.000Z",
      "cve": "CVE-2026-63959",
      "id": "msrc_CVE-2026-63959",
      "initial_release_date": "2026-07-21T01:02:06.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63959.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63959\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:14.780\",\"lastModified\":\"2026-07-20T07:16:41.073\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT\\n\\nA broken/malicious port can transmit a CRC-valid frame whose header\\nadvertises up to seven data objects but whose body carries fewer than\\nthat.  Check for this, and rightfully reject the message, instead of\\nreading from uninitialized stack memory.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/typec/tcpm/tcpci_maxim_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6f413b559f86a2894188e082e389ff95ee428345\",\"lessThan\":\"0af00f1459f5dd757f0d392f8caa38039561ac62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f413b559f86a2894188e082e389ff95ee428345\",\"lessThan\":\"dc17721d42e6d89f63572e63add8306a0e15eb3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f413b559f86a2894188e082e389ff95ee428345\",\"lessThan\":\"9b496e3371c04f0a03b7faa5d2442536d00e3998\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f413b559f86a2894188e082e389ff95ee428345\",\"lessThan\":\"c4ab8e2d4432abb646c5c0687f8dab173da901f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f413b559f86a2894188e082e389ff95ee428345\",\"lessThan\":\"aa2f716327be1818e1cb156da8a2844804aaec2f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/typec/tcpm/tcpci_maxim_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0af00f1459f5dd757f0d392f8caa38039561ac62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b496e3371c04f0a03b7faa5d2442536d00e3998\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa2f716327be1818e1cb156da8a2844804aaec2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4ab8e2d4432abb646c5c0687f8dab173da901f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc17721d42e6d89f63572e63add8306a0e15eb3c\",\"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.