GHSA-7C6H-FGVG-XW96

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-19 21:32
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read

The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source.

Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack.

Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read.

Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call.

Severity ?
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43380"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:49Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses \u0027data\u0027 as the destination and \u0027data_char\u0027 as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since \u0027data\u0027 is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized \u0027data_char\u0027 and writing to \u0027data\u0027, resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding \u0027data_char\u0027 to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call.",
  "id": "GHSA-7c6h-fgvg-xw96",
  "modified": "2026-05-19T21:32:02Z",
  "published": "2026-05-08T15:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43380"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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