{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2018-5407 Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2018/msrc_cve-2018-5407.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.",
    "tracking": {
      "current_release_date": "2026-08-07T00:24:28.000Z",
      "generator": {
        "date": "2026-08-07T22:35:12.082Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2018-5407",
      "initial_release_date": "2026-04-29T01:10:49.000Z",
      "revision_history": [
        {
          "date": "2026-04-29T01:10:49.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-04-29T15:01:50.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-08-07T00:24:28.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              },
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "cbl2 shim-unsigned-aarch64 0:15-5.cbl2",
                "product": {
                  "name": "cbl2 shim-unsigned-aarch64 0:15-5.cbl2",
                  "product_id": "7"
                }
              },
              {
                "category": "product_version_range",
                "name": "azl3 shim-unsigned-aarch64 0:16.1-1.azl3",
                "product": {
                  "name": "azl3 shim-unsigned-aarch64 0:16.1-1.azl3",
                  "product_id": "4"
                }
              }
            ],
            "category": "product_name",
            "name": "shim-unsigned-aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 shim-unsigned-x64 0:16.1-1.azl3",
                "product": {
                  "name": "azl3 shim-unsigned-x64 0:16.1-1.azl3",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version_range",
                "name": "cbl2 shim-unsigned-x64 0:15.8-1.cbl2",
                "product": {
                  "name": "cbl2 shim-unsigned-x64 0:15.8-1.cbl2",
                  "product_id": "6"
                }
              }
            ],
            "category": "product_name",
            "name": "shim-unsigned-x64"
          },
          {
            "category": "product_name",
            "name": "azl3 shim-unsigned-aarch64 0:16.1-2.azl3",
            "product": {
              "name": "azl3 shim-unsigned-aarch64 0:16.1-2.azl3",
              "product_id": "2"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 shim-unsigned-x64 0:16.1-2.azl3",
            "product": {
              "name": "azl3 shim-unsigned-x64 0:16.1-2.azl3",
              "product_id": "1"
            }
          },
          {
            "category": "product_name",
            "name": "cbl2 shim-unsigned-aarch64 15-5",
            "product": {
              "name": "cbl2 shim-unsigned-aarch64 15-5",
              "product_id": "8"
            }
          },
          {
            "category": "product_name",
            "name": "cbl2 shim-unsigned-x64 15.8-1",
            "product": {
              "name": "cbl2 shim-unsigned-x64 15.8-1",
              "product_id": "5"
            }
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 shim-unsigned-aarch64 0:15-5.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-7"
        },
        "product_reference": "7",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 shim-unsigned-x64 0:16.1-1.azl3 as a component of Azure Linux 3.0",
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        },
        "product_reference": "3",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
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          "product_id": "17084-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 shim-unsigned-x64 0:16.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 shim-unsigned-x64 0:15.8-1.cbl2 as a component of CBL Mariner 2.0",
          "product_id": "17086-6"
        },
        "product_reference": "6",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 shim-unsigned-aarch64 0:16.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-4"
        },
        "product_reference": "4",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2018-5407",
      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "notes": [
        {
          "category": "general",
          "text": "certcc",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17086-7",
          "17084-3",
          "17086-6",
          "17084-4"
        ],
        "under_investigation": [
          "17084-2",
          "17084-1",
          "0-8",
          "0-5"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2018-5407 Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'. - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2018/msrc_cve-2018-5407.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-04-29T01:10:49.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-7"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-04-29T01:10:49.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-3"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-04-29T01:10:49.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-6"
          ]
        },
        {
          "category": "none_available",
          "date": "2026-04-29T01:10:49.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-4"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 4.7,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "17086-7",
            "17084-3",
            "17086-6",
            "17084-4"
          ]
        }
      ],
      "title": "Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'."
    }
  ]
}