ghsa-hx7m-g669-h6j3
Vulnerability from github
Published
2025-02-27 03:34
Modified
2025-10-23 15:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()

Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() where shifting the constant "1" (of type int) by bitmap->mapped.pgshift (an unsigned long value) could result in undefined behavior.

The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds 31 (e.g., pgshift = 63) the shift operation overflows, as the result cannot be represented in a 32-bit type.

To resolve this, the constant is updated to "1UL", promoting it to an unsigned long type to match the operand's type.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21724"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-27T02:15:16Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index()\n\nResolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index()\nwhere shifting the constant \"1\" (of type int) by bitmap-\u003emapped.pgshift\n(an unsigned long value) could result in undefined behavior.\n\nThe constant \"1\" defaults to a 32-bit \"int\", and when \"pgshift\" exceeds\n31 (e.g., pgshift = 63) the shift operation overflows, as the result\ncannot be represented in a 32-bit type.\n\nTo resolve this, the constant is updated to \"1UL\", promoting it to an\nunsigned long type to match the operand\u0027s type.",
  "id": "GHSA-hx7m-g669-h6j3",
  "modified": "2025-10-23T15:30:21Z",
  "published": "2025-02-27T03:34:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38ac76fc06bc6826a3e4b12a98efbe98432380a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44d9c94b7a3f29a3e07c4753603a35e9b28842a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1f8453b8ff1ab79a03820ef608256c499769cb6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5d33f01b86af44b23eea61ee309e4ef22c0cdfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e24c1551059268b37f6f40639883eafb281b8b9c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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