GHSA-7G8H-GVX7-VXJC

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64135"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:55Z",
    "severity": null
  },
  "details": "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": "GHSA-7g8h-gvx7-vxjc",
  "modified": "2026-07-19T18:31:53Z",
  "published": "2026-07-19T18:31:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64135"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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