{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64083",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64083"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] << 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO.",
  "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-2026-64083"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-19T15:41:06Z"
  }
}