ghsa-3mph-xfrg-5928
Vulnerability from github
Published
2025-10-15 21:31
Modified
2025-10-15 21:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

block: Fix the maximum minor value is blk_alloc_ext_minor()

ida_alloc_range(..., min, max, ...) returns values from min to max, inclusive.

So, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor().

This is an issue because in device_add_disk(), this value is used in: ddev->devt = MKDEV(disk->major, disk->first_minor); and NR_EXT_DEVT is '(1 << MINORBITS)'.

So, should 'disk->first_minor' be NR_EXT_DEVT, it would overflow.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49147"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:00:51Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix the maximum minor value is blk_alloc_ext_minor()\n\nida_alloc_range(..., min, max, ...) returns values from min to max,\ninclusive.\n\nSo, NR_EXT_DEVT is a valid idx returned by blk_alloc_ext_minor().\n\nThis is an issue because in device_add_disk(), this value is used in:\n   ddev-\u003edevt = MKDEV(disk-\u003emajor, disk-\u003efirst_minor);\nand NR_EXT_DEVT is \u0027(1 \u003c\u003c MINORBITS)\u0027.\n\nSo, should \u0027disk-\u003efirst_minor\u0027 be NR_EXT_DEVT, it would overflow.",
  "id": "GHSA-3mph-xfrg-5928",
  "modified": "2025-10-15T21:31:38Z",
  "published": "2025-10-15T21:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49147"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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