{
  "document" : {
    "aggregate_severity" : {
      "text" : "mittel"
    },
    "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 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."
    }, {
      "category" : "description",
      "text" : "Der Kernel stellt den Kern des Linux Betriebssystems dar.",
      "title" : "Produktbeschreibung"
    }, {
      "category" : "summary",
      "text" : "Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.",
      "title" : "Angriff"
    }, {
      "category" : "general",
      "text" : "- Linux",
      "title" : "Betroffene Betriebssysteme"
    } ],
    "publisher" : {
      "category" : "other",
      "contact_details" : "csaf-provider@cert-bund.de",
      "name" : "Bundesamt für Sicherheit in der Informationstechnik",
      "namespace" : "https://www.bsi.bund.de"
    },
    "references" : [ {
      "category" : "self",
      "summary" : "WID-SEC-W-2023-2457 - CSAF Version",
      "url" : "https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2023-2457.json"
    }, {
      "category" : "self",
      "summary" : "WID-SEC-2023-2457 - Portal Version",
      "url" : "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-2457"
    }, {
      "category" : "external",
      "summary" : "Amazon Linux Security Advisory ALASMICROVM-KERNEL-4.14-2023-001 vom 2023-09-27",
      "url" : "https://alas.aws.amazon.com/AL2/ALASMICROVM-KERNEL-4.14-2023-001.html"
    }, {
      "category" : "external",
      "summary" : "Amazon Linux Security Advisory ALAS-2021-1719 vom 2021-11-04",
      "url" : "https://alas.aws.amazon.com/AL2/ALAS-2021-1719.html"
    }, {
      "category" : "external",
      "summary" : "Red Hat Bugzilla - Bug 2005258 vom 2021-09-27",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2005258"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4648 vom 2021-11-15",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4648"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4647 vom 2021-11-15",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4647"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4650 vom 2021-11-15",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4650"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4646 vom 2021-11-15",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4646"
    }, {
      "category" : "external",
      "summary" : "Oracle Linux Security Advisory ELSA-2021-4647 vom 2021-11-18",
      "url" : "https://linux.oracle.com/errata/ELSA-2021-4647.html"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4875 vom 2021-11-30",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4875"
    }, {
      "category" : "external",
      "summary" : "Red Hat Security Advisory RHSA-2021:4871 vom 2021-11-30",
      "url" : "https://access.redhat.com/errata/RHSA-2021:4871"
    }, {
      "category" : "external",
      "summary" : "Debian Security Advisory DLA-2843 vom 2021-12-16",
      "url" : "https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html"
    }, {
      "category" : "external",
      "summary" : "Ubuntu Security Notice USN-5209-1 vom 2022-01-06",
      "url" : "https://ubuntu.com/security/notices/USN-5209-1"
    }, {
      "category" : "external",
      "summary" : "Debian Security Advisory DLA-2941 vom 2022-03-09",
      "url" : "https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"
    }, {
      "category" : "external",
      "summary" : "Debian Security Advisory DSA-5096 vom 2022-03-09",
      "url" : "https://lists.debian.org/debian-security-announce/2022/msg00063.html"
    }, {
      "category" : "external",
      "summary" : "Ubuntu Security Notice USN-5343-1 vom 2022-03-22",
      "url" : "https://ubuntu.com/security/notices/USN-5343-1"
    }, {
      "category" : "external",
      "summary" : "Oracle Linux Security Advisory ELSA-2022-9313 vom 2022-04-26",
      "url" : "http://linux.oracle.com/errata/ELSA-2022-9313.html"
    }, {
      "category" : "external",
      "summary" : "Oracle Linux Security Advisory ELSA-2022-9314 vom 2022-04-26",
      "url" : "http://linux.oracle.com/errata/ELSA-2022-9314.html"
    }, {
      "category" : "external",
      "summary" : "Oracle Linux Security Advisory ELSA-2022-9367 vom 2022-05-10",
      "url" : "http://linux.oracle.com/errata/ELSA-2022-9367.html"
    }, {
      "category" : "external",
      "summary" : "Oracle Linux Security Advisory ELSA-2022-9366 vom 2022-05-10",
      "url" : "http://linux.oracle.com/errata/ELSA-2022-9366.html"
    } ],
    "source_lang" : "en-US",
    "title" : "Linux Kernel: Schwachstelle ermöglicht Denial of Service",
    "tracking" : {
      "current_release_date" : "2023-09-27T22:00:00.000+00:00",
      "generator" : {
        "date" : "2024-08-15T17:58:54.066+00:00",
        "engine" : {
          "name" : "BSI-WID",
          "version" : "1.3.5"
        }
      },
      "id" : "WID-SEC-W-2023-2457",
      "initial_release_date" : "2021-09-27T22:00:00.000+00:00",
      "revision_history" : [ {
        "date" : "2021-09-27T22:00:00.000+00:00",
        "number" : "1",
        "summary" : "Initiale Fassung"
      }, {
        "date" : "2021-11-04T23:00:00.000+00:00",
        "number" : "2",
        "summary" : "Neue Updates von Amazon aufgenommen"
      }, {
        "date" : "2021-11-15T23:00:00.000+00:00",
        "number" : "3",
        "summary" : "Neue Updates von Red Hat aufgenommen"
      }, {
        "date" : "2021-11-17T23:00:00.000+00:00",
        "number" : "4",
        "summary" : "Neue Updates von Oracle Linux aufgenommen"
      }, {
        "date" : "2021-11-30T23:00:00.000+00:00",
        "number" : "5",
        "summary" : "Neue Updates von Red Hat aufgenommen"
      }, {
        "date" : "2021-12-16T23:00:00.000+00:00",
        "number" : "6",
        "summary" : "Neue Updates von Debian aufgenommen"
      }, {
        "date" : "2022-01-05T23:00:00.000+00:00",
        "number" : "7",
        "summary" : "Neue Updates von Ubuntu aufgenommen"
      }, {
        "date" : "2022-03-09T23:00:00.000+00:00",
        "number" : "8",
        "summary" : "Neue Updates von Debian aufgenommen"
      }, {
        "date" : "2022-03-22T23:00:00.000+00:00",
        "number" : "9",
        "summary" : "Neue Updates von Ubuntu aufgenommen"
      }, {
        "date" : "2022-04-25T22:00:00.000+00:00",
        "number" : "10",
        "summary" : "Neue Updates von Oracle Linux aufgenommen"
      }, {
        "date" : "2022-05-10T22:00:00.000+00:00",
        "number" : "11",
        "summary" : "Neue Updates von Oracle Linux aufgenommen"
      }, {
        "date" : "2023-09-27T22:00:00.000+00:00",
        "number" : "12",
        "summary" : "Neue Updates von Amazon aufgenommen"
      } ],
      "status" : "final",
      "version" : "12"
    }
  },
  "product_tree" : {
    "branches" : [ {
      "branches" : [ {
        "category" : "product_name",
        "name" : "Amazon Linux 2",
        "product" : {
          "name" : "Amazon Linux 2",
          "product_id" : "398363",
          "product_identification_helper" : {
            "cpe" : "cpe:/o:amazon:linux_2:-"
          }
        }
      } ],
      "category" : "vendor",
      "name" : "Amazon"
    }, {
      "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" : "Open Source Linux Kernel < 5.4-rc1",
        "product" : {
          "name" : "Open Source Linux Kernel < 5.4-rc1",
          "product_id" : "T020506",
          "product_identification_helper" : {
            "cpe" : "cpe:/o:linux:linux_kernel:5.4-rc1"
          }
        }
      } ],
      "category" : "vendor",
      "name" : "Open Source"
    }, {
      "branches" : [ {
        "category" : "product_name",
        "name" : "Oracle Linux",
        "product" : {
          "name" : "Oracle Linux",
          "product_id" : "T004914",
          "product_identification_helper" : {
            "cpe" : "cpe:/o:oracle:linux:-"
          }
        }
      } ],
      "category" : "vendor",
      "name" : "Oracle"
    }, {
      "branches" : [ {
        "category" : "product_name",
        "name" : "Red Hat Enterprise Linux",
        "product" : {
          "name" : "Red Hat Enterprise Linux",
          "product_id" : "67646",
          "product_identification_helper" : {
            "cpe" : "cpe:/o:redhat:enterprise_linux:-"
          }
        }
      } ],
      "category" : "vendor",
      "name" : "Red Hat"
    }, {
      "branches" : [ {
        "category" : "product_name",
        "name" : "Ubuntu Linux",
        "product" : {
          "name" : "Ubuntu Linux",
          "product_id" : "T000126",
          "product_identification_helper" : {
            "cpe" : "cpe:/o:canonical:ubuntu_linux:-"
          }
        }
      } ],
      "category" : "vendor",
      "name" : "Ubuntu"
    } ]
  },
  "vulnerabilities" : [ {
    "cve" : "CVE-2021-20317",
    "notes" : [ {
      "category" : "description",
      "text" : "Es besteht eine Schwachstelle im Linux-Kernel aufgrund eines Fehlers in der Funktion \"timerqueue_add\" in [lib/timerqueue.c]. Ein lokaler Angreifer mit speziellen Benutzerrechten kann dies ausnutzen, um einen Denial of Service-Zustand auszulösen."
    } ],
    "product_status" : {
      "known_affected" : [ "2951", "67646", "T000126", "398363", "T004914" ]
    },
    "release_date" : "2021-09-27T22:00:00.000+00:00",
    "title" : "CVE-2021-20317"
  } ]
}