FKIE_CVE-2026-64083

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the pin-status word as pins_status = read_buf[0] + (read_buf[1] << 8); right after i2c_smbus_read_block_data(), guarding only against an error return. A well-behaved device returns 2 bytes for GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or 1-byte response too. If the device returns 0 bytes, both read_buf slots are uninitialized stack memory; if it returns 1 byte, read_buf[1] is. The composed value then flows through set_bit() into the caller's *bits in adm1266_gpio_get_multiple(), or into the return value of adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and the char-dev ioctls). That leaks a few bits of kernel stack per request on any device whose firmware glitch, bus error, or hostile slave produces a short block-read response. Add the missing length check to both call sites and surface a short response as -EIO.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fd9196aad9e5a3845cea17de3405ebc700382142",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "ee4799becf7d2af3778007e22c2e55c4009a49c7",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "c603b6c6840ac0c6285f5eefea0de6242710af21",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "eb3cd9bb590460c6127145cb245be925d23f5232",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "64fa9328948ddcc0f7f3c23ea1756c126d9dffac",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            },
            {
              "lessThan": "a7232f68c43ca62f545049b7f5fbfc75137b843b",
              "status": "affected",
              "version": "d98dfad35c38c037b37c4adc99df01da571031a5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s\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",
  "lastModified": "2026-07-19T16:17:48.910",
  "metrics": {},
  "published": "2026-07-19T16:17:48.910",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.