CVE-2022-50131 (GCVE-0-2022-50131)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2026-08-05 08:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write() Smatch Warning: drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() '&mcp->txbuf[5]' too small (59 vs 255) drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf' too small (34 vs 255) The 'len' variable can take a value between 0-255 as it can come from data->block[0] and it is user data. So add an bound check to prevent a buffer overflow in memcpy().
References
Impacted products
Vendor Product Version
Linux Linux Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
Version: 67a95c21463d066060b0f66d65a75d45bb386ffb
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-mcp2221.c"
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          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.18",
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              "status": "unaffected",
              "version": "5.19.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: prevent a buffer overflow in mcp_smbus_write()\n\nSmatch Warning:\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy()\n\u0027\u0026mcp-\u003etxbuf[5]\u0027 too small (59 vs 255)\ndrivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() \u0027buf\u0027\ntoo small (34 vs 255)\n\nThe \u0027len\u0027 variable can take a value between 0-255 as it can come from\ndata-\u003eblock[0] and it is user data. So add an bound check to prevent a\nbuffer overflow in memcpy()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The overflow is reached via the local i2c-dev I2C_SMBUS ioctl into mcp_smbus_xfer()/mcp_smbus_write(), not by crafted USB HID reports. An attached MCP2221 is a deployment precondition; the attack is a local syscall against /dev/i2c-N.\nAC:L - An attacker who can open the adapter sets data-\u003eblock[0] above I2C_SMBUS_BLOCK_MAX and triggers memcpy into txbuf[64] on the write path before any USB/I2C slave response, so no race or external state is required.\nPR:L - i2cdev_open() has no capability check; access depends on /dev/i2c-* permissions (commonly 0660 root:i2c or equivalent on embedded/industrial systems), which is basic local access rather than real root.\nUI:N - Exploitation needs only ioctl(I2C_SMBUS) with an oversized block write (I2C_SMBUS_BLOCK_DATA / I2C_SMBUS_I2C_BLOCK_DATA / BLOCK_PROC_CALL); no victim interaction is required.\nS:U - This is ordinary host-kernel heap memory corruption (local privilege escalation/DoS) with no VM escape, IOMMU bypass, or other cross-authority impact.\nC:H - Oversized memcpy into mcp-\u003etxbuf overflows the heap-allocated struct mcp2221 and adjacent heap, a memory-corruption primitive that can be leveraged for information disclosure.\nI:H - Out-of-bounds heap write of up to ~196 bytes past txbuf (controlled length from data-\u003eblock[0]) can corrupt adjacent state including pointers (e.g. gc) and enable integrity compromise/control-flow hijacking.\nA:H - The same heap corruption can oops or panic the kernel even when not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:57:29.234Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/66c8e816f2f2ca4a61b406503bd10bad1b35f72f"
        },
        {
          "url": "https://git.kernel.org/stable/c/91443c669d280937968f0aa4edefa741cfe35314"
        },
        {
          "url": "https://git.kernel.org/stable/c/6402116a7b5ec80fa40fd145a80c813019cd555f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270"
        },
        {
          "url": "https://git.kernel.org/stable/c/62ac2473553a00229e67bdf3cb023b62cf7f5a9a"
        }
      ],
      "title": "HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50131",
    "datePublished": "2025-06-18T11:02:56.796Z",
    "dateReserved": "2025-06-18T10:57:27.418Z",
    "dateUpdated": "2026-08-05T08:57:29.234Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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