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      {
        "category": "summary",
        "text": "An update for redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
      {
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        "text": "The ovirt-node-ng packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.\n\nSecurity Fix(es):\n\n* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)\n\nNote: This is the redhat-virtualization-host side of the CVE-2018-3639 mitigation.\n\nRed Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "https://access.redhat.com/errata/RHSA-2018:1696",
        "url": "https://access.redhat.com/errata/RHSA-2018:1696"
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        "summary": "https://access.redhat.com/security/vulnerabilities/ssbd",
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        "summary": "1566890",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1566890"
      },
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        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2018/rhsa-2018_1696.json"
      }
    ],
    "title": "Red Hat Security Advisory: redhat-virtualization-host security update",
    "tracking": {
      "current_release_date": "2025-11-21T18:05:02+00:00",
      "generator": {
        "date": "2025-11-21T18:05:02+00:00",
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      "id": "RHSA-2018:1696",
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          "date": "2018-05-23T08:29:16+00:00",
          "number": "1",
          "summary": "Initial version"
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          "number": "2",
          "summary": "Last updated version"
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        {
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Jann Horn"
          ],
          "organization": "Google Project Zero"
        },
        {
          "names": [
            "Ken Johnson"
          ],
          "organization": "Microsoft Security Response Center"
        }
      ],
      "cve": "CVE-2018-3639",
      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "discovery_date": "2018-03-12T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1566890"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: cpu: speculative store bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ssbd",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.2-20180518.2.el7_5.src",
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.2-20180518.2.el7_5.noarch"
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-3639"
        },
        {
          "category": "external",
          "summary": "RHBZ#1566890",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1566890"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-3639",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-3639"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-3639",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-3639"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/ssbd",
          "url": "https://access.redhat.com/security/vulnerabilities/ssbd"
        },
        {
          "category": "external",
          "summary": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528",
          "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528"
        },
        {
          "category": "external",
          "summary": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf",
          "url": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf"
        },
        {
          "category": "external",
          "summary": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf",
          "url": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf"
        },
        {
          "category": "external",
          "summary": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html",
          "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html"
        }
      ],
      "release_date": "2018-05-21T21:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-05-23T08:29:16+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          ],
          "restart_required": {
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          },
          "url": "https://access.redhat.com/errata/RHSA-2018:1696"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.0"
          },
          "products": [
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            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.2-20180518.2.el7_5.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "hw: cpu: speculative store bypass"
    }
  ]
}