GHSA-F54W-PGR9-9WV8

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

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

dm mirror: fix integer overflow in create_dirty_log()

The argument count calculation in create_dirty_log() performs *args_used = 2 + param_count before validating against argc. When a user provides a param_count close to UINT_MAX via the device mapper table string, this unsigned addition wraps around to a small value, causing the subsequent argc < *args_used check to be bypassed.

The overflowed param_count is then passed as argc to dm_dirty_log_create(), where it can cause out-of-bounds reads on the argv array.

Fix by comparing param_count against argc - 2 before performing the addition, following the same pattern used by parse_features() in the same file. Since argc >= 2 is already guaranteed, the subtraction is safe.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46023"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm mirror: fix integer overflow in create_dirty_log()\n\nThe argument count calculation in create_dirty_log() performs\n`*args_used = 2 + param_count` before validating against argc. When a\nuser provides a param_count close to UINT_MAX via the device mapper\ntable string, this unsigned addition wraps around to a small value,\ncausing the subsequent `argc \u003c *args_used` check to be bypassed.\n\nThe overflowed param_count is then passed as argc to dm_dirty_log_create(),\nwhere it can cause out-of-bounds reads on the argv array.\n\nFix by comparing param_count against argc - 2 before performing the\naddition, following the same pattern used by parse_features() in the\nsame file. Since argc \u003e= 2 is already guaranteed, the subtraction is\nsafe.",
  "id": "GHSA-f54w-pgr9-9wv8",
  "modified": "2026-05-27T15:33:21Z",
  "published": "2026-05-27T15:33:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17a08791d428885d00e510864283a7b839792368"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35f6b3281efd44d19110574663bc17a610bc73b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47dad9eea75d33212d3d2cea10e7ed6a1bfc0713"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c788c6f921b22f9b6c3f316c4a071c05683e7de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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