Vulnerability-Lookup

GHSA-55HM-QVFP-55MJ

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

HID: mcp2221: validate report size in mcp2221_raw_event()

mcp2221_raw_event() never validates the size of incoming HID reports. In the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3] as the copy length without checking that 4 + data[3] bytes actually exist in the received report. A malicious or misbehaving USB device can send a short report with a large data[3], causing the memcpy to read past the valid report data in the HID transfer buffer and leak uninitialized kernel memory back to userspace through the I2C/SMBus read path.

Add a minimum size check at entry and validate that the source range fits within the received report before the copy.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89621"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: validate report size in mcp2221_raw_event()\n\nmcp2221_raw_event() never validates the size of incoming HID reports.\nIn the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3]\nas the copy length without checking that 4 + data[3] bytes actually\nexist in the received report. A malicious or misbehaving USB device can\nsend a short report with a large data[3], causing the memcpy to read\npast the valid report data in the HID transfer buffer and leak\nuninitialized kernel memory back to userspace through the I2C/SMBus\nread path.\n\nAdd a minimum size check at entry and validate that the source range\nfits within the received report before the copy.",
  "id": "GHSA-55hm-qvfp-55mj",
  "modified": "2026-09-14T15:32:32Z",
  "published": "2026-09-11T21:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89621"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89621 (GCVE-0-2026-89621)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01

Title

HID: mcp2221: validate report size in mcp2221_raw_event()

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: validate report size in mcp2221_raw_event() mcp2221_raw_event() never validates the size of incoming HID reports. In the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3] as the copy length without checking that 4 + data[3] bytes actually exist in the received report. A malicious or misbehaving USB device can send a short report with a large data[3], causing the memcpy to read past the valid report data in the HID transfer buffer and leak uninitialized kernel memory back to userspace through the I2C/SMBus read path. Add a minimum size check at entry and validate that the source range fits within the received report before the copy.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/cb38b1f149b714335…
https://git.kernel.org/stable/c/b2c67dc0e30c30864…
https://git.kernel.org/stable/c/fffcfa367072628c3…
https://git.kernel.org/stable/c/c1c508e8923911cb4…
https://git.kernel.org/stable/c/bdc6a3af0dd734a32…
https://git.kernel.org/stable/c/127de5919820f88a9…
https://git.kernel.org/stable/c/7c18fb36708a97ff6…
https://git.kernel.org/stable/c/2c9a6998c19503626…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < cb38b1f149b7143355b37e86c841acf0076e5c2a (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < fffcfa367072628c3144cca17d2a3c3c9e50c057 (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < c1c508e8923911cb458234997e55b7a4b9aa066f (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < 127de5919820f88a9d55e8371ad4ac49f625f4c5 (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < 7c18fb36708a97ff6772825cc087b6d537bbf0d5 (git) Affected: 67a95c21463d066060b0f66d65a75d45bb386ffb , < 2c9a6998c19503626c57a2267bf279e204113079 (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-mcp2221.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cb38b1f149b7143355b37e86c841acf0076e5c2a",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "fffcfa367072628c3144cca17d2a3c3c9e50c057",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "c1c508e8923911cb458234997e55b7a4b9aa066f",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "127de5919820f88a9d55e8371ad4ac49f625f4c5",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "7c18fb36708a97ff6772825cc087b6d537bbf0d5",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            },
            {
              "lessThan": "2c9a6998c19503626c57a2267bf279e204113079",
              "status": "affected",
              "version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-mcp2221.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: validate report size in mcp2221_raw_event()\n\nmcp2221_raw_event() never validates the size of incoming HID reports.\nIn the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3]\nas the copy length without checking that 4 + data[3] bytes actually\nexist in the received report. A malicious or misbehaving USB device can\nsend a short report with a large data[3], causing the memcpy to read\npast the valid report data in the HID transfer buffer and leak\nuninitialized kernel memory back to userspace through the I2C/SMBus\nread path.\n\nAdd a minimum size check at entry and validate that the source range\nfits within the received report before the copy."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:35.297Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149"
        },
        {
          "url": "https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079"
        }
      ],
      "title": "HID: mcp2221: validate report size in mcp2221_raw_event()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89621",
    "datePublished": "2026-09-11T19:45:19.420Z",
    "dateReserved": "2026-09-11T19:38:34.736Z",
    "dateUpdated": "2026-09-14T12:01:35.297Z",
    "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-55HM-QVFP-55MJ

CVE-2026-89621 (GCVE-0-2026-89621)

Tags

Sightings

Nomenclature