Vulnerability-Lookup

FKIE_CVE-2026-64083

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-09-03 12:46

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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      "affectedData": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
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  "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": "2026-09-03T12:46:33.593",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
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  "published": "2026-07-19T16:17:48.910",
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}

CVE-2026-64083 (GCVE-0-2026-64083)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39

Title

hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors

Summary

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/fd9196aad9e5a3845…
https://git.kernel.org/stable/c/ee4799becf7d2af37…
https://git.kernel.org/stable/c/c603b6c6840ac0c62…
https://git.kernel.org/stable/c/a2d1c819348b36fcc…
https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7…
https://git.kernel.org/stable/c/eb3cd9bb590460c61…
https://git.kernel.org/stable/c/64fa9328948ddcc0f…
https://git.kernel.org/stable/c/a7232f68c43ca62f5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < fd9196aad9e5a3845cea17de3405ebc700382142 (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < ee4799becf7d2af3778007e22c2e55c4009a49c7 (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < c603b6c6840ac0c6285f5eefea0de6242710af21 (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < eb3cd9bb590460c6127145cb245be925d23f5232 (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < 64fa9328948ddcc0f7f3c23ea1756c126d9dffac (git) Affected: d98dfad35c38c037b37c4adc99df01da571031a5 , < a7232f68c43ca62f545049b7f5fbfc75137b843b (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/adm1266.c"
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:39:54.756Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"
        },
        {
          "url": "https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"
        }
      ],
      "title": "hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64083",
    "datePublished": "2026-07-19T15:39:54.756Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-07-19T15:39:54.756Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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