GHSA-P924-4557-4G43

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) reject implausible blackbox record_count

adm1266_nvmem_read_blackbox() loops over a record_count that comes straight from byte 3 of the BLACKBOX_INFO response. The destination buffer is data->dev_mem, sized for the nvmem cell's declared 2048 bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64). A device that reports a record_count greater than 32 -- whether due to firmware bugs, bus corruption, or a non-responsive slave returning 0xff -- would walk read_buff past the end of the dev_mem allocation on the trailing iterations.

Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here) before entering the loop and return -EIO on any larger value, so a malformed BLACKBOX_INFO response cannot drive the loop out of bounds.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64087"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:49Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject implausible blackbox record_count\n\nadm1266_nvmem_read_blackbox() loops over a record_count that comes\nstraight from byte 3 of the BLACKBOX_INFO response.  The destination\nbuffer is data-\u003edev_mem, sized for the nvmem cell\u0027s declared 2048\nbytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64).\nA device that reports a record_count greater than 32 -- whether due\nto firmware bugs, bus corruption, or a non-responsive slave returning\n0xff -- would walk read_buff past the end of the dev_mem allocation\non the trailing iterations.\n\nCap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here)\nbefore entering the loop and return -EIO on any larger value, so a\nmalformed BLACKBOX_INFO response cannot drive the loop out of bounds.",
  "id": "GHSA-p924-4557-4g43",
  "modified": "2026-07-19T18:31:51Z",
  "published": "2026-07-19T18:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e791cd0140fb136083565aadfbe0f705aa260d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/231db52a5b64d0a9769e298dadc148e1f79b26a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4afca954622d672ea65ed961bed01cf91caa034e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5469e1e7c411acc15fdd8262c99c3ebd9defd594"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75c862adf3d3caab4f49bb3530723c215376e37c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adcb163ad7cacca317872fc62bd8885e842e45e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2c56092710fe8a893b67b5a3d7e62808d02d84d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f85c81e93dbd6915970bd5f3bffcf62633c4c54c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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