{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d98dfad35c38c037b37c4adc99df01da571031a5"
            },
            {
              "fixed": "fd9196aad9e5a3845cea17de3405ebc700382142"
            },
            {
              "fixed": "ee4799becf7d2af3778007e22c2e55c4009a49c7"
            },
            {
              "fixed": "c603b6c6840ac0c6285f5eefea0de6242710af21"
            },
            {
              "fixed": "a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"
            },
            {
              "fixed": "ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"
            },
            {
              "fixed": "eb3cd9bb590460c6127145cb245be925d23f5232"
            },
            {
              "fixed": "64fa9328948ddcc0f7f3c23ea1756c126d9dffac"
            },
            {
              "fixed": "a7232f68c43ca62f545049b7f5fbfc75137b843b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.10.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.142"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64083.json"
  },
  "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] \u003c\u003c 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.",
  "id": "CVE-2026-64083",
  "modified": "2026-07-21T03:42:15.717448850Z",
  "published": "2026-07-19T15:39:54.756Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64083.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64083"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors"
}