Linux Distros Unpatched Vulnerability : CVE-2026-84410

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

include('compat.inc');

if (description)
{
  script_id(379094);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/11");

  script_cve_id("CVE-2026-84410");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-84410");

  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.

  - In apport before 2.37.0, an improper privilege management vulnerability allows an unprivileged local
    attacker to gain root privileges on systems where automatic crash reporting is enabled. The automatic
    crash report processing pipeline runs as root and executes ldd on the attacker-controlled ExecutablePath
    field of a crash file placed in the world-writable /var/crash directory, causing the dynamic loader to
    load and execute an attacker-supplied audit module specified by the ELF's DT_AUDIT tag. This allows an
    attacker to execute arbitrary code with root privileges and fully compromise the affected system.
    (CVE-2026-84410)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-84410");
  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:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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-2026-84410");

  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:"2026/11/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  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:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apport");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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/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-26.04", "Host/OS/Ubuntu Linux-26.10");

  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/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python-apport"},
          {"reference": "python-problem-report"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python-apport"},
          {"reference": "python-problem-report"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python-apport"},
          {"reference": "python-problem-report"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-core-dump-handler"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-core-dump-handler"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.10",
        "pkgs": [
          {"reference": "apport"},
          {"reference": "apport-core-dump-handler"},
          {"reference": "apport-gtk"},
          {"reference": "apport-kde"},
          {"reference": "apport-noui"},
          {"reference": "apport-retrace"},
          {"reference": "apport-valgrind"},
          {"reference": "dh-apport"},
          {"reference": "python3-apport"},
          {"reference": "python3-problem-report"}
        ]
      }
    ]
  }
};

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');
}