Linux Distros Unpatched Vulnerability : CVE-2026-11850

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(321101);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/15");

  script_cve_id("CVE-2026-11850");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-11850");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in
    plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2)
    without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then
    truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and
    memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack
    vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len
    < 2, triggering the underflow when the KDC or kadmind reads principal data. (CVE-2026-11850)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-11850");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-11850");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-11850");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-11850");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-libs");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-workstation");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-xrealmauthz");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libkadm5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-pkinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-pkinit-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-server-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:krb5-workstation");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-6", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10", "Host/OS/Ubuntu Linux-26.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4t64"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10t64"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4t64"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
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          {"reference": "libkrad-dev"},
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          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
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          {"reference": "krb5-kdc"},
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          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
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          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
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          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
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        "pkgs": [
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          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4t64"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10t64"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4t64"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
          {"reference": "libkadm5srv-mit12"},
          {"reference": "libkdb5-10t64"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit9"},
          {"reference": "libkadm5srv-mit8"},
          {"reference": "libkadm5srv-mit9"},
          {"reference": "libkdb5-7"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "krb5-admin-server"},
          {"reference": "krb5-doc"},
          {"reference": "krb5-gss-samples"},
          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
          {"reference": "libgssapi-krb5-2"},
          {"reference": "libgssrpc4"},
          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit9"},
          {"reference": "libkadm5srv-mit9"},
          {"reference": "libkdb5-8"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
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      }
    ]
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  "Ubuntu Linux-18.04": {
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      {
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          {"reference": "krb5-k5tls"},
          {"reference": "krb5-kdc"},
          {"reference": "krb5-kdc-ldap"},
          {"reference": "krb5-kpropd"},
          {"reference": "krb5-locales"},
          {"reference": "krb5-multidev"},
          {"reference": "krb5-otp"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-user"},
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  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "krb5-xrealmauthz"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "krb5-xrealmauthz"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit-openssl"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
          {"reference": "krb5-libs"},
          {"reference": "krb5-pkinit"},
          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}