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HID: mcp2221: validate report size in mcp2221_raw_event()

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-89621

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89621

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/hid/hid-mcp2221.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/hid/hid-mcp2221.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89621

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#35128 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-89621 · Revision 1Source updated