FKIE_CVE-2026-64135

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) 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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081
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": "33251abb9c9dd62943be76f0427c5527ee39188f",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "ba09f4baa5bd96c5d26c942defa546a72dbbe5bf",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "0dbf64c502443c08c2e28a77ecbfcc5479d93228",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "2b7a698d5093b548c464828d984f05ced5f3fd2a",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "ca560f7566df7e2826c2999e959e6b94eb938f76",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "7f705e581ef3e6bb308a121a89adf5237d968204",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "versionType": "git"
            },
            {
              "lessThan": "eee213daa1e1b402eb631bcd1b8c5aa340a6b081",
              "status": "affected",
              "version": "15609d1893020436e1e8ccfd9ded774a96dd17a2",
              "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) 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": "2026-07-19T16:17:55.333",
  "metrics": {},
  "published": "2026-07-19T16:17:55.333",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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