CVE-2023-53171 (GCVE-0-2023-53171)
Vulnerability from cvelistv5
Published
2025-09-15 14:04
Modified
2025-09-15 14:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vfio/type1: prevent underflow of locked_vm via exec() When a vfio container is preserved across exec, the task does not change, but it gets a new mm with locked_vm=0, and loses the count from existing dma mappings. If the user later unmaps a dma mapping, locked_vm underflows to a large unsigned value, and a subsequent dma map request fails with ENOMEM in __account_locked_vm. To avoid underflow, grab and save the mm at the time a dma is mapped. Use that mm when adjusting locked_vm, rather than re-acquiring the saved task's mm, which may have changed. If the saved mm is dead, do nothing. locked_vm is incremented for existing mappings in a subsequent patch.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7
Impacted products
Vendor Product Version
Linux Linux Version: 73fa0d10d077d9521ee2dace2307ae2c9a965336
Version: 73fa0d10d077d9521ee2dace2307ae2c9a965336
Version: 73fa0d10d077d9521ee2dace2307ae2c9a965336
Version: 73fa0d10d077d9521ee2dace2307ae2c9a965336
Version: 73fa0d10d077d9521ee2dace2307ae2c9a965336
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   Linux Linux Version: 3.6
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vfio/vfio_iommu_type1.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.16",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: prevent underflow of locked_vm via exec()\n\nWhen a vfio container is preserved across exec, the task does not change,\nbut it gets a new mm with locked_vm=0, and loses the count from existing\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\nto a large unsigned value, and a subsequent dma map request fails with\nENOMEM in __account_locked_vm.\n\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\ntask\u0027s mm, which may have changed.  If the saved mm is dead, do nothing.\n\nlocked_vm is incremented for existing mappings in a subsequent patch."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:04:04.544Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"
        }
      ],
      "title": "vfio/type1: prevent underflow of locked_vm via exec()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53171",
    "datePublished": "2025-09-15T14:04:04.544Z",
    "dateReserved": "2025-09-15T13:59:19.064Z",
    "dateUpdated": "2025-09-15T14:04:04.544Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53171\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T14:15:38.940\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvfio/type1: prevent underflow of locked_vm via exec()\\n\\nWhen a vfio container is preserved across exec, the task does not change,\\nbut it gets a new mm with locked_vm=0, and loses the count from existing\\ndma mappings.  If the user later unmaps a dma mapping, locked_vm underflows\\nto a large unsigned value, and a subsequent dma map request fails with\\nENOMEM in __account_locked_vm.\\n\\nTo avoid underflow, grab and save the mm at the time a dma is mapped.\\nUse that mm when adjusting locked_vm, rather than re-acquiring the saved\\ntask\u0027s mm, which may have changed.  If the saved mm is dead, do nothing.\\n\\nlocked_vm is incremented for existing mappings in a subsequent patch.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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