CVE-2021-47649 (GCVE-0-2021-47649)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2025-05-04 07:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
References
https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9
https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0
https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e
https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202
https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9
https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882
Impacted products
Vendor Product Version
Linux Linux Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
Version: fbb0de795078190a9834b3409e4b009cfb18a6d4
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   Linux Linux Version: 4.20
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/udmabuf.c"
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              "version": "0",
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudmabuf: validate ubuf-\u003epagecount\n\nSyzbot has reported GPF in sg_alloc_append_table_from_pages(). The\nproblem was in ubuf-\u003epages == ZERO_PTR.\n\nubuf-\u003epagecount is calculated from arguments passed from user-space. If\nuser creates udmabuf with list.size == 0 then ubuf-\u003epagecount will be\nalso equal to zero; it causes kmalloc_array() to return ZERO_PTR.\n\nFix it by validating ubuf-\u003epagecount before passing it to\nkmalloc_array()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:15:30.553Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9"
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          "url": "https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0"
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          "url": "https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e"
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          "url": "https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882"
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      ],
      "title": "udmabuf: validate ubuf-\u003epagecount",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47649",
    "datePublished": "2025-02-26T01:54:16.574Z",
    "dateReserved": "2025-02-26T01:48:21.520Z",
    "dateUpdated": "2025-05-04T07:15:30.553Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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