Vulnerability-Lookup

GHSA-C35Q-C6R4-9764

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg

ibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check in usbio_bulk_msg() compares it against txbuf_len — the bulk OUT endpoint size. Both are taken independently from different endpoints in usbio_probe(), so the check is wrong when they differ.

Use rxbuf_len for the IN direction. This matches the buffer that actually holds the response data.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74681"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:42Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg\n\nibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check\nin usbio_bulk_msg() compares it against txbuf_len \u2014 the bulk OUT\nendpoint size.  Both are taken independently from different endpoints\nin usbio_probe(), so the check is wrong when they differ.\n\nUse rxbuf_len for the IN direction.  This matches the buffer that\nactually holds the response data.",
  "id": "GHSA-c35q-c6r4-9764",
  "modified": "2026-08-22T18:30:29Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e22c9f79b200672f3e477421b6c9050d8cf70a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ad0164f78b66b0b5eca3a5748cc94dd87e28124"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebfd1e82ab0a6d26efd9bdd89de899215851f5bf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74681 (GCVE-0-2026-74681)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32

Title

usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg ibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check in usbio_bulk_msg() compares it against txbuf_len — the bulk OUT endpoint size. Both are taken independently from different endpoints in usbio_probe(), so the check is wrong when they differ. Use rxbuf_len for the IN direction. This matches the buffer that actually holds the response data.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ebfd1e82ab0a6d26e…
https://git.kernel.org/stable/c/9ad0164f78b66b0b5…
https://git.kernel.org/stable/c/7e22c9f79b200672f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < ebfd1e82ab0a6d26efd9bdd89de899215851f5bf (git) Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < 9ad0164f78b66b0b5eca3a5748cc94dd87e28124 (git) Affected: 121a0f839dbb397af5fabb701cea3e9983223e50 , < 7e22c9f79b200672f3e477421b6c9050d8cf70a5 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/misc/usbio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ebfd1e82ab0a6d26efd9bdd89de899215851f5bf",
              "status": "affected",
              "version": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "versionType": "git"
            },
            {
              "lessThan": "9ad0164f78b66b0b5eca3a5748cc94dd87e28124",
              "status": "affected",
              "version": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "versionType": "git"
            },
            {
              "lessThan": "7e22c9f79b200672f3e477421b6c9050d8cf70a5",
              "status": "affected",
              "version": "121a0f839dbb397af5fabb701cea3e9983223e50",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/misc/usbio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg\n\nibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check\nin usbio_bulk_msg() compares it against txbuf_len \u2014 the bulk OUT\nendpoint size.  Both are taken independently from different endpoints\nin usbio_probe(), so the check is wrong when they differ.\n\nUse rxbuf_len for the IN direction.  This matches the buffer that\nactually holds the response data."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:48.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ebfd1e82ab0a6d26efd9bdd89de899215851f5bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ad0164f78b66b0b5eca3a5748cc94dd87e28124"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e22c9f79b200672f3e477421b6c9050d8cf70a5"
        }
      ],
      "title": "usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74681",
    "datePublished": "2026-08-22T15:32:48.873Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
    "dateUpdated": "2026-08-22T15:32:48.873Z",
    "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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-C35Q-C6R4-9764

CVE-2026-74681 (GCVE-0-2026-74681)

Tags

Sightings

Nomenclature