GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89621",
      "date": "2026-09-14",
      "epss": "0.00209",
      "percentile": "0.11142"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89621\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:47.397\",\"lastModified\":\"2026-09-14T13:19:15.967\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/hid/hid-mcp2221.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"cb38b1f149b7143355b37e86c841acf0076e5c2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"fffcfa367072628c3144cca17d2a3c3c9e50c057\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"c1c508e8923911cb458234997e55b7a4b9aa066f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"127de5919820f88a9d55e8371ad4ac49f625f4c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"7c18fb36708a97ff6772825cc087b6d537bbf0d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"67a95c21463d066060b0f66d65a75d45bb386ffb\",\"lessThan\":\"2c9a6998c19503626c57a2267bf279e204113079\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/hid/hid-mcp2221.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T05:37:30+00:00",
      "cve": "CVE-2026-89621",
      "id": "CVE-2026-89621",
      "initial_release_date": "2026-09-11T19:45:19.420000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Information disclosure in HID mcp2221 driver via crafted USB report",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89621.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.