Vulnerability-Lookup

GHSA-9WMF-QJ6G-2Q9C

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: mxuport: fix memory corruption with small endpoint

Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63899"
  ],
  "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: mxuport: fix memory corruption with small endpoint\n\nMake sure that the bulk-out endpoint max packet size is at least eight\nbytes to avoid user-controlled slab corruption should a malicious device\nreport a smaller size.",
  "id": "GHSA-9wmf-qj6g-2q9c",
  "modified": "2026-07-19T18:31:45Z",
  "published": "2026-07-19T18:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63899"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-63899 (GCVE-0-2026-63899)

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

Title

USB: serial: mxuport: fix memory corruption with small endpoint

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/086b858b5f5125bc9…
https://git.kernel.org/stable/c/2f3661eb2446e1ef5…
https://git.kernel.org/stable/c/ccbec56f2f9af008f…
https://git.kernel.org/stable/c/be3a1ed4ae51fa8dd…
https://git.kernel.org/stable/c/e906545641d34fb1a…
https://git.kernel.org/stable/c/6c0cf56f00f280d72…
https://git.kernel.org/stable/c/b40166b4ef9606762…
https://git.kernel.org/stable/c/4085f0dbb1ce2251c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < 086b858b5f5125bc9d967ea2bd825f83d9f8f29d (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < 2f3661eb2446e1ef593da45e01a3b21a906768ec (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < ccbec56f2f9af008f1574335cc6a668f16603e47 (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < be3a1ed4ae51fa8dde57383277d336ce834f2cd9 (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < e906545641d34fb1a09a65b4b5cfdff40eb09681 (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < 6c0cf56f00f280d72180bb6ce79741bc787a6269 (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < b40166b4ef96067620a0f248e74ad9658c8f680c (git) Affected: ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e , < 4085f0dbb1ce2251c9a5938d693de6593f0ab2bd (git)
Linux	Linux	Affected: 3.14 Unaffected: 0 , < 3.14 (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: 6.12.93 , ≤ 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/serial/mxuport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "086b858b5f5125bc9d967ea2bd825f83d9f8f29d",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "2f3661eb2446e1ef593da45e01a3b21a906768ec",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "ccbec56f2f9af008f1574335cc6a668f16603e47",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "be3a1ed4ae51fa8dde57383277d336ce834f2cd9",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "e906545641d34fb1a09a65b4b5cfdff40eb09681",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "6c0cf56f00f280d72180bb6ce79741bc787a6269",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "b40166b4ef96067620a0f248e74ad9658c8f680c",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            },
            {
              "lessThan": "4085f0dbb1ce2251c9a5938d693de6593f0ab2bd",
              "status": "affected",
              "version": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/mxuport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "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": "6.12.93",
              "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": "5.10.259",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "3.14",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: mxuport: fix memory corruption with small endpoint\n\nMake sure that the bulk-out endpoint max packet size is at least eight\nbytes to avoid user-controlled slab corruption should a malicious device\nreport a smaller size."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:08.116Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47"
        },
        {
          "url": "https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681"
        },
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          "url": "https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269"
        },
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          "url": "https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"
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      ],
      "title": "USB: serial: mxuport: fix memory corruption with small endpoint",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63899",
    "datePublished": "2026-07-19T14:55:08.116Z",
    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-19T14:55:08.116Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-9WMF-QJ6G-2Q9C

CVE-2026-63899 (GCVE-0-2026-63899)

Tags

Sightings

Nomenclature