CVE-2026-64336 (GCVE-0-2026-64336)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-23 12:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: fix information leak The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however return the number characters submitted to the device if the write urb is not already in use. If this number is larger than the number of characters passed to write(), the line discipline continues writing data from beyond the tty write buffer. Fix the information leak by making sure that keyspan_pda_write_start() returns zero on success as intended.
References
Impacted products
Vendor Product Version
Linux Linux Version: 02407bc7d42347da7ed2a3926a0b824bfc614914
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
Version: 034e38e8f68767fb5438ae3e608ee82919674177
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/keyspan_pda.c"
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "version": "7.1.4",
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            {
              "lessThanOrEqual": "*",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          ]
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: keyspan_pda: fix information leak\n\nThe write() callback is supposed to return the number of characters\naccepted or a negative errno. Since the addition of write fifo support\nthe keyspan_pda implementation will however return the number characters\nsubmitted to the device if the write urb is not already in use. If this\nnumber is larger than the number of characters passed to write(), the\nline discipline continues writing data from beyond the tty write buffer.\n\nFix the information leak by making sure that keyspan_pda_write_start()\nreturns zero on success as intended."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:41.365Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cccef1711efbcdbe999738ac27d37b9ef6271abd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec"
        }
      ],
      "title": "USB: serial: keyspan_pda: fix information leak",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64336",
    "datePublished": "2026-07-25T08:50:01.444Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-08-23T12:45:41.365Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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