Vulnerability-Lookup

GHSA-6RFF-3VPP-QCMX

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63898"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:07Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-6rff-3vpp-qcmx",
  "modified": "2026-07-19T18:31:45Z",
  "published": "2026-07-19T18:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63898"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39e295a91e80f3b91f61c7ada2bde434dcaba20d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57f332af1745014cd7e40414814ffaa6bc7d3b5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cb48f8890f9b2051d7c34823057296a536a31c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90dbad14b109e5fdfb4934ff61e561d11ba3742d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/915b36d701950503c4ea0f6e314b10868e59fce3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94edbbc5fe00d03cfe1d4e690d7d2cd36317a935"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd2ddb3fe9052ad8703593bbec26ecc7ca92869e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8fdf33d6fcfb90cbec26299baf2352c84b2d768"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55

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

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/94edbbc5fe00d03cf…
https://git.kernel.org/stable/c/bd2ddb3fe9052ad87…
https://git.kernel.org/stable/c/39e295a91e80f3b91…
https://git.kernel.org/stable/c/90dbad14b109e5fdf…
https://git.kernel.org/stable/c/6cb48f8890f9b2051…
https://git.kernel.org/stable/c/d8fdf33d6fcfb90cb…
https://git.kernel.org/stable/c/57f332af1745014cd…
https://git.kernel.org/stable/c/915b36d701950503c…

Impacted products

2 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)
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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JSON

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        {
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          "programFiles": [
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "versionType": "original_commit_for_fix"
            }
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-6RFF-3VPP-QCMX

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

Tags

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