CVE-2022-49147 (GCVE-0-2022-49147)
Vulnerability from cvelistv5
Published
2025-02-26 01:55
Modified
2025-05-04 08:30
Severity ?
Summary
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.
References
https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb
https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272
https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a
https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca
Impacted products
Vendor Product Version
Linux Linux Version: 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae
Version: 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae
Version: 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae
Version: 22ae8ce8b89241c94ac00c237752c0ffa37ba5ae
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   Linux Linux Version: 5.11
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/genhd.c"
          ],
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          "vendor": "Linux",
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              "version": "0",
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              "versionType": "semver"
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      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:30:59.109Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5b9ac3727e4abb11c9cfbe9c0781fc05dfdd7cfb"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f8cf8f5ccbad25ed6828875b222dbab29d5c272"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbe2cc4525480ddd20c866bb5c0578071e01451a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1868328dec5ae2cf210111025fcbc71f78dd5ca"
        }
      ],
      "title": "block: Fix the maximum minor value is blk_alloc_ext_minor()",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49147",
    "datePublished": "2025-02-26T01:55:15.373Z",
    "dateReserved": "2025-02-26T01:49:39.271Z",
    "dateUpdated": "2025-05-04T08:30:59.109Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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