CVE-2026-63898 (GCVE-0-2026-63898)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
USB: serial: mct_u232: fix memory corruption with small endpoint
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: mct_u232: fix memory corruption with small endpoint The driver overrides the maximum transfer size for a specific device which only accepts 16 byte packets for its 32 byte bulk-out endpoint. Make sure to never increase the maximum transfer size to prevent slab corruption should a malicious device report a smaller endpoint max packet size than expected.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 94edbbc5fe00d03cfe1d4e690d7d2cd36317a935 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bd2ddb3fe9052ad8703593bbec26ecc7ca92869e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 39e295a91e80f3b91f61c7ada2bde434dcaba20d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 90dbad14b109e5fdfb4934ff61e561d11ba3742d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6cb48f8890f9b2051d7c34823057296a536a31c5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d8fdf33d6fcfb90cbec26299baf2352c84b2d768 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 57f332af1745014cd7e40414814ffaa6bc7d3b5b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 915b36d701950503c4ea0f6e314b10868e59fce3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 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": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/mct_u232.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.12"
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              "status": "unaffected",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: mct_u232: fix memory corruption with small endpoint\n\nThe driver overrides the maximum transfer size for a specific device\nwhich only accepts 16 byte packets for its 32 byte bulk-out endpoint.\n\nMake sure to never increase the maximum transfer size to prevent slab\ncorruption should a malicious device report a smaller endpoint max\npacket size than expected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:07.452Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/94edbbc5fe00d03cfe1d4e690d7d2cd36317a935"
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        {
          "url": "https://git.kernel.org/stable/c/bd2ddb3fe9052ad8703593bbec26ecc7ca92869e"
        },
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          "url": "https://git.kernel.org/stable/c/39e295a91e80f3b91f61c7ada2bde434dcaba20d"
        },
        {
          "url": "https://git.kernel.org/stable/c/90dbad14b109e5fdfb4934ff61e561d11ba3742d"
        },
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          "url": "https://git.kernel.org/stable/c/6cb48f8890f9b2051d7c34823057296a536a31c5"
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        {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63898",
    "datePublished": "2026-07-19T14:55:07.452Z",
    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-19T14:55:07.452Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63898",
      "date": "2026-07-21",
      "epss": "0.0021",
      "percentile": "0.11355"
    },
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  }
}



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Taxonomy of the tags.





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.