{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64135",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64135"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX\n\nadm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and\npasses it to i2c_smbus_read_block_data() to retrieve the 4-byte\nBLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour\ncaller buffer sizes -- it memcpy()s data.block[0] bytes from the\nSMBus transaction (where data.block[0] is the length byte returned by\nthe slave device, up to I2C_SMBUS_BLOCK_MAX = 32):\n\n\tmemcpy(values, &data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller's 5-byte stack buffer before the post-call\n\n\tif (ret != 4)\n\t\treturn -EIO;\n\ncheck has a chance to reject the response.\n\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\nfor any well-formed SMBus block response, matching the convention used\nby the other i2c_smbus_read_block_data() callers in this driver.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64135"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-19T15:41:06Z"
  }
}