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

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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/mct_u232.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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            },
            {
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              "status": "affected",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "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": "6.12.94",
              "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": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "versionEndExcluding": "6.1.176",
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          "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/bd2ddb3fe9052ad8703593bbec26ecc7ca92869e"
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    "datePublished": "2026-07-19T14:55:07.452Z",
    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-19T14:55:07.452Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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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.

Action not permitted

GHSA-6RFF-3VPP-QCMX

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

Tags

Sightings

Nomenclature