USN-3756-1 (UBUNTU-CVE-2018-3639)

Vulnerability from osv_ubuntu – Published: 2018-08-27 18:48 – Updated: 2026-06-03 10:45 – Source website
VLAI
Summary
intel-microcode vulnerabilities
Details

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy discovered that microprocessors that perform speculative reads of system registers may allow unauthorized disclosure of system parameters via a sidechannel attack. This vulnerability is also known as Rogue System Register Read (RSRE). An attacker could use this to expose sensitive information. (CVE-2018-3640)

References
To clipboard 

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  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-3639",
              "severity": [
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                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
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                  "type": "CVSS_V3"
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            }
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        }
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      "ecosystem_specific": {
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        ]
      },
      "package": {
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      ]
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    {
      "database_specific": {
        "cves_map": {
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              "id": "CVE-2018-3639",
              "severity": [
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                  "type": "CVSS_V3"
                },
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                }
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            },
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              "id": "CVE-2018-3646",
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          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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            "binary_version": "3.20180807a.0ubuntu0.16.04.1"
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      },
      "package": {
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        "name": "intel-microcode",
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      ]
    },
    {
      "database_specific": {
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              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3640",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3646",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "high",
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            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
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            "binary_version": "3.20180807a.0ubuntu0.18.04.1"
          }
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      },
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        "3.20180425.1~ubuntu0.18.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker in a guest virtual machine could use this to expose sensitive\ninformation (memory from other guests or the host OS). (CVE-2018-3646)\n\nJann Horn and Ken Johnson discovered that microprocessors utilizing\nspeculative execution of a memory read may allow unauthorized memory reads\nvia a sidechannel attack. This flaw is known as Spectre Variant 4. A local\nattacker could use this to expose sensitive information, including kernel\nmemory. (CVE-2018-3639)\n\nZdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy\ndiscovered that microprocessors that perform speculative reads of\nsystem registers may allow unauthorized disclosure of system parameters\nvia a sidechannel attack. This vulnerability is also known as Rogue\nSystem Register Read (RSRE). An attacker could use this to expose\nsensitive information. (CVE-2018-3640)\n",
  "id": "USN-3756-1",
  "modified": "2026-06-03T10:45:17Z",
  "published": "2018-08-27T18:48:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3756-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3639"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3640"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3646"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "intel-microcode vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-3639",
    "UBUNTU-CVE-2018-3640",
    "UBUNTU-CVE-2018-3646"
  ]
}



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