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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-11-06 16:44
VLAI
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:35 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
Affected: 02407bc7d42347da7ed2a3926a0b824bfc614914 (git)
Affected: 5.10.266 , < 5.11 (semver)
guessed Create a notification for this product.
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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "tags": [
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          },
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            "tags": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T22:01:58+00:00",
      "cve": "CVE-2026-64336",
      "id": "CVE-2026-64336",
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      "product_status:known_affected": "172",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: serial: keyspan_pda: fix information leak",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64336.json",
      "version": "3"
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                      {
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
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          "title": "USB: serial: keyspan_pda: fix information leak",
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        "cveId": "CVE-2026-64336",
        "datePublished": "2026-07-25T08:50:01.444Z",
        "dateReserved": "2026-07-19T15:36:31.781Z",
        "dateUpdated": "2026-11-06T16:44:46.678Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • 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.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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