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      "text": "Important"
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    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for microcode_ctl is now available for Red Hat Enterprise Linux 8.\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"
      },
      {
        "category": "general",
        "text": "The microcode_ctl packages provide microcode updates for Intel and AMD processors.\n\nSecurity Fix(es):\n\n* kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling (CVE-2025-35973)\n\n* kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM (CVE-2025-31936)\n\nBug Fix(es) and Enhancement(s):\n\n* [RHEL 8] Update Intel CPU microcode to the latest version (JIRA:RHEL-240770)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "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"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:65147",
        "url": "https://access.redhat.com/errata/RHSA-2026:65147"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/#important",
        "url": "https://access.redhat.com/security/updates/classification/#important"
      },
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        "category": "external",
        "summary": "2514104",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514104"
      },
      {
        "category": "external",
        "summary": "2514115",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514115"
      },
      {
        "category": "external",
        "summary": "RHEL-240770",
        "url": "https://issues.redhat.com/browse/RHEL-240770"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_65147.json"
      }
    ],
    "title": "Red Hat Security Advisory: microcode_ctl security, bug fix, and enhancement update",
    "tracking": {
      "current_release_date": "2026-09-09T07:44:19+00:00",
      "generator": {
        "date": "2026-09-09T07:44:19+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.3.17"
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      "id": "RHSA-2026:65147",
      "initial_release_date": "2026-09-08T10:06:08+00:00",
      "revision_history": [
        {
          "date": "2026-09-08T10:06:08+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-08T10:06:08+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-09-09T07:44:19+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
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                  "product_id": "BaseOS-8.10.0.Z.MAIN.EUS",
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            "name": "Red Hat Enterprise Linux"
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                "name": "microcode_ctl-4:20260812-1.el8_10.src",
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                    "purl": "pkg:rpm/redhat/microcode_ctl@20260812-1.el8_10?arch=src\u0026epoch=4"
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                "name": "microcode_ctl-4:20260812-1.el8_10.x86_64",
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-31936",
      "cwe": {
        "id": "CWE-823",
        "name": "Use of Out-of-range Pointer Offset"
      },
      "discovery_date": "2026-08-11T16:52:54.610522+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2514115"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Intel(R) Xeon(R) 6 processors when using Intel(R) TDX within System Management Mode (SMM). Improper handling of overlap between protected memory ranges may allow a local attacker with privileged user access to escalate privileges. This vulnerability could lead to high impact on confidentiality and integrity of the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important privilege escalation flaw affects Intel Xeon 6 Processors when Intel TDX is enabled, allowing a privileged local attacker to escalate privileges within the System Management Mode (SMM). Exploitation requires a high complexity attack and specific internal knowledge, impacting the confidentiality and integrity of the system.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.src",
          "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-31936"
        },
        {
          "category": "external",
          "summary": "RHBZ#2514115",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514115"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-31936",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-31936"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-31936",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-31936"
        },
        {
          "category": "external",
          "summary": "https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01379.html",
          "url": "https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01379.html"
        }
      ],
      "release_date": "2026-08-11T16:28:06.168000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-08T10:06:08+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",
          "product_ids": [
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.src",
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:65147"
        },
        {
          "category": "workaround",
          "details": "This vulnerability only affects systems using Intel Trust Domain Extensions (TDX) on Intel Xeon 6 processors. Systems not using Intel TDX are not vulnerable to this issue. Disabling Intel TDX, where feasible, removes the exposure to this vulnerability.",
          "product_ids": [
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.src",
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.src",
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM"
    },
    {
      "cve": "CVE-2025-35973",
      "cwe": {
        "id": "CWE-266",
        "name": "Incorrect Privilege Assignment"
      },
      "discovery_date": "2026-08-11T16:52:22.336117+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2514104"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Intel(R) Processors within Ring 0, affecting the kernel, hypervisor, and bare metal operating systems. Improper handling of values may allow an authorized adversary with privileged user access to perform a local, high-complexity attack. This can lead to an escalation of privilege, potentially resulting in high impact to the confidentiality and integrity of the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat is aware of a hardware vulnerability affecting some Intel processors that could allow a local attacker who already has privileged access to escalate privileges by exploiting improper handling of internal processor values during Ring 0 execution. In the most severe case, this could allow a privileged workload running inside a virtual machine to escalate access into the underlying hypervisor. Exploitation requires local access, existing privileged access, and a high degree of attack complexity, including detailed knowledge of the processor\u0027s internal behavior.\n\nRed Hat products that provide workload isolation using a hypervisor, such as Red Hat OpenShift sandboxed containers (which uses Kata Containers), are assessed as Important severity because of the potential impact on isolation between different tenants\u0027 workloads if the underlying processor is vulnerable and has not been updated.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-35973"
        },
        {
          "category": "external",
          "summary": "RHBZ#2514104",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514104"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-35973",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-35973"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-35973",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-35973"
        },
        {
          "category": "external",
          "summary": "https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01428.html",
          "url": "https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01428.html"
        }
      ],
      "release_date": "2026-08-11T16:28:25.564000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-08T10:06:08+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",
          "product_ids": [
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.src",
            "BaseOS-8.10.0.Z.MAIN.EUS:microcode_ctl-4:20260812-1.el8_10.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:65147"
        },
        {
          "category": "workaround",
          "details": "This is a hardware-level vulnerability in the affected Intel processors. There is no code-level fix available in Red Hat OpenShift sandboxed containers or other affected Red Hat components; the issue must be addressed at the processor firmware layer.\n\nRed Hat recommends that customers apply the latest CPU microcode or system firmware update from their hardware manufacturer. Intel has released microcode updates addressing this issue; see Intel Security Advisory INTEL-SA-01428 (https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01428.html) for affected processor families and update guidance.\n\nIntel has indicated that a further Trusted Computing Base (TCB) recovery is planned for this issue. Red Hat will update this guidance if additional remediation steps become necessary once that information is available.",
          "product_ids": [
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling"
    }
  ]
}