CVE-2025-40293 (GCVE-0-2025-40293)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-11 21:46
VLAI
Title
iommufd: Don't overflow during division for dirty tracking
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7100 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 , < 07105e61882ff4a7d58db63cc5f9e90c6c60506c (git)
Affected: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 , < 4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69 (git)
Affected: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 , < de7f2c67ceb1941b05b04ac35458a03e93cc57b1 (git)
Affected: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 , < dbf316fc90aa954dcd5440817f4b944627ed63e0 (git)
Affected: 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 , < cb30dfa75d55eced379a42fd67bd5fb7ec38555e (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommufd/iova_bitmap.c"
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          "vendor": "Linux",
          "versions": [
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      "cpeApplicability": [
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          "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": "2026-05-11T21:46:32.879Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "iommufd: Don\u0027t overflow during division for dirty tracking",
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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": "2026-05-11T21:46:32.879Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-18",
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        "descriptions": [
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            "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommufd: No desbordar durante la divisi\u00f3n para el seguimiento de suciedad\n\nSi pgshift es 63, entonces BITS_PER_TYPE(bitmap -\u003e bitmap) * pgsize se desbordar\u00e1 a 0 y esto provoca una divisi\u00f3n por 0.\n\nEn este caso, el \u00edndice deber\u00eda ser simplemente 0, as\u00ed que se reorganizan las cosas para dividir por shift y evitar cualquier desbordamiento."
          }
        ],
        "id": "CVE-2025-40293",
        "lastModified": "2026-10-14T22:10:00.210",
        "metrics": {},
        "published": "2025-12-08T01:16:01.293",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-06-30T10:31:45+00:00",
      "cve": "CVE-2025-40293",
      "id": "CVE-2025-40293",
      "initial_release_date": "2025-12-08T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommufd: Don\u0027t overflow during division for dirty tracking",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40293.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-15T16:25:53Z",
      "cve": "CVE-2025-40293",
      "id": "CVE-2025-40293",
      "initial_release_date": "2025-12-09T00:24:48Z",
      "product_status:known_affected": "481",
      "product_status:known_not_affected": "388",
      "product_status:recommended": "320",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40293",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-40293.json",
      "version": "42"
    }
  }
}



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