Linux Distros Unpatched Vulnerability : CVE-2026-107778

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

include('compat.inc');

if (description)
{
  script_id(369142);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/22");

  script_cve_id("CVE-2026-107778");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-107778");

  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.

  - MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c
    that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays.
    Attackers can send forwarded credentials with more tickets than ticket_info entries through
    gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service. (CVE-2026-107778)

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-2026-107778");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-107778");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-107778");
  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:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-107778");

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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

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  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: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");
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  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");
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  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");
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  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");
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}

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-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"},
          {"reference": "libkdb5-10t64"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
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      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "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"},
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          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
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  "Ubuntu Linux-26.04": {
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    "constraints": [
      {
        "release": "26.04",
        "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"},
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          {"reference": "libk5crypto3"},
          {"reference": "libkadm5clnt-mit12"},
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          {"reference": "libkdb5-10t64"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
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      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
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        "pkgs": [
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          {"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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "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-mit11"},
          {"reference": "libkadm5srv-mit11"},
          {"reference": "libkdb5-9"},
          {"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-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "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-mit11"},
          {"reference": "libkadm5srv-mit11"},
          {"reference": "libkdb5-9"},
          {"reference": "libkrad-dev"},
          {"reference": "libkrad0"},
          {"reference": "libkrb5-3"},
          {"reference": "libkrb5-dbg"},
          {"reference": "libkrb5-dev"},
          {"reference": "libkrb5support0"}
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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"}
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      }
    ]
  },
  "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"}
        ]
      }
    ]
  },
  "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"}
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  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
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        "pkgs": [
          {"reference": "krb5"},
          {"reference": "krb5-devel"},
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          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
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      }
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  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
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          {"reference": "krb5-devel"},
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          {"reference": "krb5-server"},
          {"reference": "krb5-server-ldap"},
          {"reference": "krb5-workstation"},
          {"reference": "libkadm5"}
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      }
    ]
  },
  "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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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');
}