vfio/type1: prevent underflow of locked_vm via exec()

{
  "id": "3b753fd5771caaf94b38d85b0ab4dcf38ba783278c81fa9698c67923cf7e9ccc",
  "url": "https://osv.dev/vulnerability/CVE-2023-53171",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vfio/type1: prevent underflow of locked_vm via exec()",
    "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.",
    "evidence": "osv:CVE-2023-53171",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.173",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.99",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53171",
      "aliases": [
        "CVE-2023-53171"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "73fa0d10d077d9521ee2dace2307ae2c9a965336"
                },
                {
                  "fixed": "5a271242716846cc016736fb76be2b40ee49b0c3"
                },
                {
                  "fixed": "eafb81c50da899dd80b340c841277acc4a1945b7"
                },
                {
                  "fixed": "a6b2aabe664098d5cf877ae0fd96459464a30e17"
                },
                {
                  "fixed": "b0790dff0760b7734cf0961f497ad64628ca550b"
                },
                {
                  "fixed": "046eca5018f8a5dd1dc2cedf87fb5843b9ea3026"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53171.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.6.0"
                },
                {
                  "fixed": "5.10.173"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.99"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53171.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.409145465Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/046eca5018f8a5dd1dc2cedf87fb5843b9ea3026",
        "https://git.kernel.org/stable/c/5a271242716846cc016736fb76be2b40ee49b0c3",
        "https://git.kernel.org/stable/c/a6b2aabe664098d5cf877ae0fd96459464a30e17",
        "https://git.kernel.org/stable/c/b0790dff0760b7734cf0961f497ad64628ca550b",
        "https://git.kernel.org/stable/c/eafb81c50da899dd80b340c841277acc4a1945b7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53171.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53171",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53171.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53171",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496937,
  "published_at": "2025-09-15T14:04:04.544+00:00"
}