CVE-2022-50156 (GCVE-0-2022-50156)
Vulnerability from cvelistv5
Published
2025-06-18 11:03
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: cp2112: prevent a buffer overflow in cp2112_xfer() Smatch warnings: drivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy() 'data->block[1]' too small (33 vs 255) drivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy() 'buf' too small (64 vs 255) The 'read_length' variable is provided by 'data->block[0]' which comes from user and it(read_length) can take a value between 0-255. Add an upper bound to 'read_length' variable to prevent a buffer overflow in memcpy().
References
Impacted products
Vendor Product Version
Linux Linux Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
Version: 542134c0375b5ca2b1d18490c02b8a20bfdd8d74
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-cp2112.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-cp2112.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.256",
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            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.211",
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            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.137",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.61",
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            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.256",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.211",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: cp2112: prevent a buffer overflow in cp2112_xfer()\n\nSmatch warnings:\ndrivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy()\n\u0027data-\u003eblock[1]\u0027 too small (33 vs 255)\ndrivers/hid/hid-cp2112.c:793 cp2112_xfer() error: __memcpy() \u0027buf\u0027 too\nsmall (64 vs 255)\n\nThe \u0027read_length\u0027 variable is provided by \u0027data-\u003eblock[0]\u0027 which comes\nfrom user and it(read_length) can take a value between 0-255. Add an\nupper bound to \u0027read_length\u0027 variable to prevent a buffer overflow in\nmemcpy()."
        }
      ],
      "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 triggered through the local i2c-dev I2C_SMBUS ioctl path into cp2112_xfer(), not by crafted USB HID reports from a malicious peripheral. Presence of a CP2112 adapter is a deployment precondition; the attack itself is a local syscall against /dev/i2c-N.\nAC:L - An attacker who can open the adapter reliably sets data-\u003eblock[0] above I2C_SMBUS_BLOCK_MAX (e.g. 33\u201361) and completes a normal I2C block read; no race or unpredictable state outside attacker influence is required. CP2112 deployments typically have responding I2C slaves (EEPROMs/sensors) that the attacker can address.\nPR:L - i2cdev_open() performs no capability check; access is governed by /dev/i2c-* permissions, commonly 0660 root:i2c or similarly granted to unprivileged service accounts on embedded/industrial systems. That is basic local access, not real root/init-namespace admin rights.\nUI:N - Exploitation requires only the attacker issuing ioctl(I2C_SMBUS) with I2C_SMBUS_I2C_BLOCK_DATA; no victim action is needed.\nS:U - This is ordinary kernel memory corruption within the host OS authority (local privilege escalation/DoS), with no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - The bug is an out-of-bounds write of attacker-chosen length (and I2C-sourced contents) past union i2c_smbus_data on the stack, which is memory corruption that can be leveraged for information disclosure.\nI:H - Out-of-bounds stack write via memcpy(data-\u003eblock+1, buf, read_length) with read_length up to 61 into a 33-byte destination enables integrity compromise and potential control-flow hijacking.\nA:H - The same memory corruption can crash the kernel (oops/panic) even when not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:57:33.812Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3af7d60e9a6c17d6d41c4341f8020511887d372d"
        },
        {
          "url": "https://git.kernel.org/stable/c/519ff31a6ddd87aa4905bd9bf3b92e8b88801614"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebda3d6b004bb6127a66a616524a2de152302ca7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8489a20ac481b08c0391608d81ed3796d373cfdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7028944e61014ae915e7fb74963d3835f2f761a"
        },
        {
          "url": "https://git.kernel.org/stable/c/26e427ac85c2b8d0d108cc80b6de34d33e2780c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/381583845d19cb4bd21c8193449385f3fefa9caf"
        }
      ],
      "title": "HID: cp2112: prevent a buffer overflow in cp2112_xfer()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50156",
    "datePublished": "2025-06-18T11:03:13.913Z",
    "dateReserved": "2025-06-18T10:57:27.425Z",
    "dateUpdated": "2026-08-05T08:57:33.812Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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