CVE-2025-40293 (GCVE-0-2025-40293)
Vulnerability from cvelistv5
Published
2025-12-08 00:46
Modified
2025-12-08 00:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: iommufd: Don't overflow during division for dirty tracking If pgshift is 63 then BITS_PER_TYPE(*bitmap->bitmap) * pgsize will overflow to 0 and this triggers divide by 0. In this case the index should just be 0, so reorganize things to divide by shift and avoid hitting any overflows.
References
Impacted products
Vendor Product Version
Linux Linux Version: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1
Version: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1
Version: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1
Version: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1
Version: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommufd/iova_bitmap.c"
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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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\niommufd: Don\u0027t overflow during division for dirty tracking\n\nIf pgshift is 63 then BITS_PER_TYPE(*bitmap-\u003ebitmap) * pgsize will overflow\nto 0 and this triggers divide by 0.\n\nIn this case the index should just be 0, so reorganize things to divide\nby shift and avoid hitting any overflows."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-12-08T00:46:16.850Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/07105e61882ff4a7d58db63cc5f9e90c6c60506c"
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        },
        {
          "url": "https://git.kernel.org/stable/c/cb30dfa75d55eced379a42fd67bd5fb7ec38555e"
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      ],
      "title": "iommufd: Don\u0027t overflow during division for dirty tracking",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40293",
    "datePublished": "2025-12-08T00:46:16.850Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2025-12-08T00:46:16.850Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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