Vulnerability-Lookup

CVE-2026-64336 (GCVE-0-2026-64336)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

USB: serial: keyspan_pda: fix information leak

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.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/b069b7029862fafaf…
https://git.kernel.org/stable/c/e52ca411f50539ff1…
https://git.kernel.org/stable/c/2f7a6b8ab3845bd1d…
https://git.kernel.org/stable/c/e1494191a3aac665d…
https://git.kernel.org/stable/c/cf6ca0aefae03958c…
https://git.kernel.org/stable/c/d4b12b6b395e43a2b…
https://git.kernel.org/stable/c/6bfc8d01ac4068ece…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < b069b7029862fafaff331d4c664d97d4ae828d6d (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < e52ca411f50539ff1d0c877b9312771ca8a858c1 (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < 2f7a6b8ab3845bd1da02604f1a874b52a4555a72 (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < e1494191a3aac665d3a2fce16169a97c346253ec (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < cf6ca0aefae03958cfb5b189b0adbfb25c06bfac (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < d4b12b6b395e43a2b1d80be3745631fcaa9c047b (git) Affected: 034e38e8f68767fb5438ae3e608ee82919674177 , < 6bfc8d01ac4068eced509f8fc74d0cd205e4dcec (git)
Linux	Linux	Affected: 5.11 Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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        {
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          "programFiles": [
            "drivers/usb/serial/keyspan_pda.c"
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "7.1.4",
              "versionType": "semver"
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          "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": "2026-07-25T08:50:01.444Z",
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        "shortName": "Linux"
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    "datePublished": "2026-07-25T08:50:01.444Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-07-25T08:50:01.444Z",
    "state": "PUBLISHED"
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      "date": "2026-07-26",
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      "percentile": "0.06935"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:34Z",
      "cve": "CVE-2026-64336",
      "id": "CVE-2026-64336",
      "initial_release_date": "2026-07-25T16:01:34Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64336",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64336.json",
      "version": "2"
    }
  }
}

GHSA-MHG5-FR5X-3G7C

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64336"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:15Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-mhg5-fr5x-3g7c",
  "modified": "2026-07-25T12:31:32Z",
  "published": "2026-07-25T12:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64336"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64336 (GCVE-0-2026-64336)

GHSA-MHG5-FR5X-3G7C

Tags

Sightings

Nomenclature