{
  "document": {
    "aggregate_severity": {
      "text": "High"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/vex/2023/cve-2023-40547-els_os-almalinux9_2esu.json"
      }
    ],
    "title": "Security update on CVE-2023-40547",
    "tracking": {
      "current_release_date": "2026-01-19T22:18:24Z",
      "generator": {
        "date": "2026-01-19T22:18:24Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2023-40547-ELS_OS-ALMALINUX9.2ESU",
      "initial_release_date": "2023-01-01T00:00:00Z",
      "revision_history": [
        {
          "date": "2023-01-01T00:00:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-10-08T17:50:59Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2025-10-30T10:42:43Z",
          "number": "3",
          "summary": "Update document"
        },
        {
          "date": "2025-11-29T11:35:22Z",
          "number": "4",
          "summary": "Update document"
        },
        {
          "date": "2025-12-23T19:08:30Z",
          "number": "5",
          "summary": "Update document"
        },
        {
          "date": "2026-01-19T22:18:24Z",
          "number": "6",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "6"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "AlmaLinux 9.2",
                "product": {
                  "name": "AlmaLinux 9.2",
                  "product_id": "AlmaLinux-9.2",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:almalinux:almalinux:9.2:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "AlmaLinux"
          }
        ],
        "category": "vendor",
        "name": "AlmaLinux OS Foundation"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
                "product": {
                  "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
                  "product_id": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/shim-x64@15.8-1.el9.alma.1.tuxcare.els1?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64",
                "product": {
                  "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64",
                  "product_id": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/shim-x64@15.8-1.el9.alma.1.tuxcare.els2?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "shim-x64-0:15.8-1.el9.alma.1.x86_64",
                "product": {
                  "name": "shim-x64-0:15.8-1.el9.alma.1.x86_64",
                  "product_id": "shim-x64-0:15.8-1.el9.alma.1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/almalinux/shim-x64@15.8-1.el9.alma.1?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "AlmaLinux OS Foundation"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64"
        },
        "product_reference": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64"
        },
        "product_reference": "shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "shim-x64-0:15.8-1.el9.alma.1.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.x86_64"
        },
        "product_reference": "shim-x64-0:15.8-1.el9.alma.1.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-40547",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "description",
          "text": "A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.",
          "title": "Vulnerability description"
        },
        {
          "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": [
          "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
          "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64"
        ],
        "known_affected": [
          "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2023-40547"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1834",
          "url": "https://access.redhat.com/errata/RHSA-2024:1834"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1835",
          "url": "https://access.redhat.com/errata/RHSA-2024:1835"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1873",
          "url": "https://access.redhat.com/errata/RHSA-2024:1873"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1876",
          "url": "https://access.redhat.com/errata/RHSA-2024:1876"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1883",
          "url": "https://access.redhat.com/errata/RHSA-2024:1883"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1902",
          "url": "https://access.redhat.com/errata/RHSA-2024:1902"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1903",
          "url": "https://access.redhat.com/errata/RHSA-2024:1903"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:1959",
          "url": "https://access.redhat.com/errata/RHSA-2024:1959"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2024:2086",
          "url": "https://access.redhat.com/errata/RHSA-2024:2086"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2023-40547",
          "url": "https://access.redhat.com/security/cve/CVE-2023-40547"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2234589",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2234589"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2024/01/26/1",
          "url": "http://www.openwall.com/lists/oss-security/2024/01/26/1"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html",
          "url": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html"
        }
      ],
      "release_date": "2024-01-25T16:15:00Z",
      "remediations": [
        {
          "category": "none_available",
          "details": "Affected",
          "product_ids": [
            "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els1.x86_64",
            "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.tuxcare.els2.x86_64",
            "AlmaLinux-9.2:shim-x64-0:15.8-1.el9.alma.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}