Vulnerability-Lookup

FKIE_CVE-2026-64135

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-08-13 15:08

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) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to retrieve the 4-byte BLACKBOX_INFO response. i2c_smbus_read_block_data() does not honour caller buffer sizes -- it memcpy()s data.block[0] bytes from the SMBus transaction (where data.block[0] is the length byte returned by the slave device, up to I2C_SMBUS_BLOCK_MAX = 32): memcpy(values, &data.block[1], data.block[0]); If the device returns any block length above 5, the call overflows the caller's 5-byte stack buffer before the post-call if (ret != 4) return -EIO; check has a chance to reject the response. Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room for any well-formed SMBus block response, matching the convention used by the other i2c_smbus_read_block_data() callers in this driver.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081	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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      "value": "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, \u0026data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller\u0027s 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."
    }
  ],
  "id": "CVE-2026-64135",
  "lastModified": "2026-08-13T15:08:35.963",
  "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",
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-07-19T16:17:55.333",
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  ]
}

CVE-2026-64135 (GCVE-0-2026-64135)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40

Title

hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/33251abb9c9dd6294…
https://git.kernel.org/stable/c/ba09f4baa5bd96c5d…
https://git.kernel.org/stable/c/6ed16a40b162e9d87…
https://git.kernel.org/stable/c/0dbf64c502443c08c…
https://git.kernel.org/stable/c/2b7a698d5093b548c…
https://git.kernel.org/stable/c/ca560f7566df7e282…
https://git.kernel.org/stable/c/7f705e581ef3e6bb3…
https://git.kernel.org/stable/c/eee213daa1e1b402e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 33251abb9c9dd62943be76f0427c5527ee39188f (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < ba09f4baa5bd96c5d26c942defa546a72dbbe5bf (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 0dbf64c502443c08c2e28a77ecbfcc5479d93228 (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 2b7a698d5093b548c464828d984f05ced5f3fd2a (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < ca560f7566df7e2826c2999e959e6b94eb938f76 (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < 7f705e581ef3e6bb308a121a89adf5237d968204 (git) Affected: 15609d1893020436e1e8ccfd9ded774a96dd17a2 , < eee213daa1e1b402eb631bcd1b8c5aa340a6b081 (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

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        {
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          "programFiles": [
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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) 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, \u0026data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:29.676Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204"
        },
        {
          "url": "https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"
        }
      ],
      "title": "hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64135",
    "datePublished": "2026-07-19T15:40:29.676Z",
    "dateReserved": "2026-07-19T07:54:57.036Z",
    "dateUpdated": "2026-07-19T15:40:29.676Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-64135

CVE-2026-64135 (GCVE-0-2026-64135)

Tags

Sightings

Nomenclature