WID-SEC-W-2026-1306

Vulnerability from csaf_certbund - Published: 2026-04-28 22:00 - Updated: 2026-05-04 22:00
Summary
Xen und Citrix Systems XenServer: Mehrere Schwachstellen
Severity
Hoch
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Xen ist ein Virtueller-Maschinen-Monitor (VMM), der Hardware (x86, IA-64, PowerPC) für die darauf laufenden Systeme (Domains) paravirtualisiert. Citrix XenServer ist eine Lösung für das Management, die Konfiguration und den Betrieb virtueller Maschinen auf Servern.
Angriff: Ein Angreifer kann mehrere Schwachstellen in Xen und Citrix Systems XenServer ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen, Daten zu verändern und offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
Betroffene Betriebssysteme: - Linux - Sonstiges - Windows
CVE-2026-23558
CVE-2026-23556
CVE-2026-23559
CVE-2026-23560
CVE-2026-23561
CVE-2026-23562
CVE-2026-42486
CVE-2026-23557
CVE-2026-31786
CVE-2026-31787
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Xen ist ein Virtueller-Maschinen-Monitor (VMM), der Hardware (x86, IA-64, PowerPC) f\u00fcr die darauf laufenden Systeme (Domains) paravirtualisiert.\r\nCitrix XenServer ist eine L\u00f6sung f\u00fcr das Management, die Konfiguration und den Betrieb virtueller Maschinen auf Servern.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Xen und Citrix Systems XenServer ausnutzen, um seine Privilegien zu erh\u00f6hen, Sicherheitsma\u00dfnahmen zu umgehen, Daten zu ver\u00e4ndern und offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- Sonstiges\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1306 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1306.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1306 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1306"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-483.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-484.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-485.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-486.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-487.html"
      },
      {
        "category": "external",
        "summary": "Xen Security Advisory vom 2026-04-28",
        "url": "https://xenbits.xen.org/xsa/advisory-489.html"
      },
      {
        "category": "external",
        "summary": "Citrix XenServer Security Update vom 2026-04-28",
        "url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696527\u0026articleURL=XenServer_Security_Update_for_Multiple_Issues"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:1657-1 vom 2026-04-29",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-April/025766.html"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-0C9AFF64A5 vom 2026-04-29",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-0c9aff64a5"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-78CD69D9AE vom 2026-04-29",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-78cd69d9ae"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DSA-6238 vom 2026-05-04",
        "url": "https://lists.debian.org/debian-security-announce/2026/msg00148.html"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DSA-6243 vom 2026-05-04",
        "url": "https://lists.debian.org/debian-security-announce/2026/msg00154.html"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2026:10660-1 vom 2026-05-04",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/2ZGHLYRMCFK5DY7XYNQC3RXMO73GDQX6/"
      }
    ],
    "source_lang": "en-US",
    "title": "Xen und Citrix Systems XenServer: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-04T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-05T08:06:17.342+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-1306",
      "initial_release_date": "2026-04-28T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-04-28T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-04-29T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von SUSE und Fedora aufgenommen"
        },
        {
          "date": "2026-05-03T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Debian und European Union Vulnerability Database aufgenommen"
        },
        {
          "date": "2026-05-04T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von openSUSE aufgenommen"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "8.4",
                "product": {
                  "name": "Citrix Systems XenServer 8.4",
                  "product_id": "T053402",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:citrix:xenserver:8.4"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "XenServer"
          }
        ],
        "category": "vendor",
        "name": "Citrix Systems"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Debian Linux",
            "product": {
              "name": "Debian Linux",
              "product_id": "2951",
              "product_identification_helper": {
                "cpe": "cpe:/o:debian:debian_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Debian"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "74185",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=4.0",
                "product": {
                  "name": "Open Source Xen \u003e=4.0",
                  "product_id": "T053396"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003e=4.0",
                "product": {
                  "name": "Open Source Xen \u003e=4.0",
                  "product_id": "T053396-fixed"
                }
              },
              {
                "category": "product_version",
                "name": "XSA-419",
                "product": {
                  "name": "Open Source Xen XSA-419",
                  "product_id": "T053397",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:xen:xen:xsa-419"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "XAPI",
                "product": {
                  "name": "Open Source Xen XAPI",
                  "product_id": "T053398",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:xen:xen:xapi"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003e=4.2",
                "product": {
                  "name": "Open Source Xen \u003e=4.2",
                  "product_id": "T053399"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003e=4.2",
                "product": {
                  "name": "Open Source Xen \u003e=4.2",
                  "product_id": "T053399-fixed"
                }
              },
              {
                "category": "product_version_range",
                "name": "Linux kernel \u003e=4.13",
                "product": {
                  "name": "Open Source Xen Linux kernel \u003e=4.13",
                  "product_id": "T053400"
                }
              },
              {
                "category": "product_version_range",
                "name": "Linux kernel \u003e=4.13",
                "product": {
                  "name": "Open Source Xen Linux kernel \u003e=4.13",
                  "product_id": "T053400-fixed"
                }
              },
              {
                "category": "product_version_range",
                "name": "Linux PVH or HVM \u003e=3.8",
                "product": {
                  "name": "Open Source Xen Linux PVH or HVM \u003e=3.8",
                  "product_id": "T053401"
                }
              },
              {
                "category": "product_version_range",
                "name": "Linux PVH or HVM \u003e=3.8",
                "product": {
                  "name": "Open Source Xen Linux PVH or HVM \u003e=3.8",
                  "product_id": "T053401-fixed"
                }
              }
            ],
            "category": "product_name",
            "name": "Xen"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T002207",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          },
          {
            "category": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23558",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "T053402",
          "74185",
          "T053399"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23558"
    },
    {
      "cve": "CVE-2026-23556",
      "product_status": {
        "known_affected": [
          "T053397",
          "2951",
          "T002207",
          "T027843",
          "T053402",
          "74185"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23556"
    },
    {
      "cve": "CVE-2026-23559",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "T053402",
          "74185",
          "T053398"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23559"
    },
    {
      "cve": "CVE-2026-23560",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "T053402",
          "74185",
          "T053398"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23560"
    },
    {
      "cve": "CVE-2026-23561",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "T053402",
          "74185",
          "T053398"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23561"
    },
    {
      "cve": "CVE-2026-23562",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185",
          "T053398"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23562"
    },
    {
      "cve": "CVE-2026-42486",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185",
          "T053398"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-42486"
    },
    {
      "cve": "CVE-2026-23557",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-23557"
    },
    {
      "cve": "CVE-2026-31786",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-31786"
    },
    {
      "cve": "CVE-2026-31787",
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "T027843",
          "74185"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-31787"
    }
  ]
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.