Linux Distros Unpatched Vulnerability : CVE-2026-25075

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

include('compat.inc');

if (description)
{
  script_id(303377);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/28");

  script_cve_id("CVE-2026-25075");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-25075");

  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.

  - strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP
    parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP
    data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate
    AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference,
    crashing the charon IKE daemon. (CVE-2026-25075)

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-2026-25075");
  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:N/C:N/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:L/PR:N/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:N/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-2026-25075");

  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:"plugin_publication_date", value:"2026/03/23");

  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:"p-cpe:/a:canonical:ubuntu_linux:strongswan");
  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");

  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": "libstrongswan"},
          {"reference": "strongswan"},
          {"reference": "strongswan-dbg"},
          {"reference": "strongswan-ike"},
          {"reference": "strongswan-nm"},
          {"reference": "strongswan-plugin-af-alg"},
          {"reference": "strongswan-plugin-agent"},
          {"reference": "strongswan-plugin-attr-sql"},
          {"reference": "strongswan-plugin-certexpire"},
          {"reference": "strongswan-plugin-coupling"},
          {"reference": "strongswan-plugin-curl"},
          {"reference": "strongswan-plugin-dhcp"},
          {"reference": "strongswan-plugin-dnscert"},
          {"reference": "strongswan-plugin-dnskey"},
          {"reference": "strongswan-plugin-duplicheck"},
          {"reference": "strongswan-plugin-eap-aka"},
          {"reference": "strongswan-plugin-eap-aka-3gpp2"},
          {"reference": "strongswan-plugin-eap-dynamic"},
          {"reference": "strongswan-plugin-eap-gtc"},
          {"reference": "strongswan-plugin-eap-md5"},
          {"reference": "strongswan-plugin-eap-mschapv2"},
          {"reference": "strongswan-plugin-eap-peap"},
          {"reference": "strongswan-plugin-eap-radius"},
          {"reference": "strongswan-plugin-eap-sim"},
          {"reference": "strongswan-plugin-eap-sim-file"},
          {"reference": "strongswan-plugin-eap-sim-pcsc"},
          {"reference": "strongswan-plugin-eap-simaka-pseudonym"},
          {"reference": "strongswan-plugin-eap-simaka-reauth"},
          {"reference": "strongswan-plugin-eap-simaka-sql"},
          {"reference": "strongswan-plugin-eap-tls"},
          {"reference": "strongswan-plugin-eap-tnc"},
          {"reference": "strongswan-plugin-eap-ttls"},
          {"reference": "strongswan-plugin-error-notify"},
          {"reference": "strongswan-plugin-farp"},
          {"reference": "strongswan-plugin-fips-prf"},
          {"reference": "strongswan-starter"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "charon-cmd"},
          {"reference": "libcharon-extra-plugins"},
          {"reference": "libstrongswan"},
          {"reference": "libstrongswan-extra-plugins"},
          {"reference": "libstrongswan-standard-plugins"},
          {"reference": "strongswan"},
          {"reference": "strongswan-charon"},
          {"reference": "strongswan-dbg"},
          {"reference": "strongswan-ike"},
          {"reference": "strongswan-ikev1"},
          {"reference": "strongswan-ikev2"},
          {"reference": "strongswan-libcharon"},
          {"reference": "strongswan-nm"},
          {"reference": "strongswan-plugin-af-alg"},
          {"reference": "strongswan-plugin-agent"},
          {"reference": "strongswan-plugin-attr-sql"},
          {"reference": "strongswan-plugin-coupling"},
          {"reference": "strongswan-plugin-curl"},
          {"reference": "strongswan-plugin-dnscert"},
          {"reference": "strongswan-plugin-dnskey"},
          {"reference": "strongswan-plugin-fips-prf"},
          {"reference": "strongswan-plugin-gcrypt"},
          {"reference": "strongswan-plugin-gmp"},
          {"reference": "strongswan-plugin-ipseckey"},
          {"reference": "strongswan-plugin-ldap"},
          {"reference": "strongswan-plugin-load-tester"},
          {"reference": "strongswan-plugin-mysql"},
          {"reference": "strongswan-plugin-ntru"},
          {"reference": "strongswan-plugin-openssl"},
          {"reference": "strongswan-plugin-pgp"},
          {"reference": "strongswan-plugin-pkcs11"},
          {"reference": "strongswan-plugin-pubkey"},
          {"reference": "strongswan-plugin-radattr"},
          {"reference": "strongswan-plugin-sql"},
          {"reference": "strongswan-plugin-sqlite"},
          {"reference": "strongswan-plugin-sshkey"},
          {"reference": "strongswan-starter"},
          {"reference": "strongswan-tnc-base"},
          {"reference": "strongswan-tnc-client"},
          {"reference": "strongswan-tnc-ifmap"},
          {"reference": "strongswan-tnc-pdp"},
          {"reference": "strongswan-tnc-server"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "charon-cmd"},
          {"reference": "charon-systemd"},
          {"reference": "libcharon-extra-plugins"},
          {"reference": "libcharon-standard-plugins"},
          {"reference": "libstrongswan"},
          {"reference": "libstrongswan-extra-plugins"},
          {"reference": "libstrongswan-standard-plugins"},
          {"reference": "strongswan"},
          {"reference": "strongswan-charon"},
          {"reference": "strongswan-libcharon"},
          {"reference": "strongswan-nm"},
          {"reference": "strongswan-pki"},
          {"reference": "strongswan-scepclient"},
          {"reference": "strongswan-starter"},
          {"reference": "strongswan-swanctl"},
          {"reference": "strongswan-tnc-base"},
          {"reference": "strongswan-tnc-client"},
          {"reference": "strongswan-tnc-ifmap"},
          {"reference": "strongswan-tnc-pdp"},
          {"reference": "strongswan-tnc-server"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "charon-cmd"},
          {"reference": "charon-systemd"},
          {"reference": "libcharon-extauth-plugins"},
          {"reference": "libcharon-extra-plugins"},
          {"reference": "libcharon-standard-plugins"},
          {"reference": "libstrongswan"},
          {"reference": "libstrongswan-extra-plugins"},
          {"reference": "libstrongswan-standard-plugins"},
          {"reference": "strongswan"},
          {"reference": "strongswan-charon"},
          {"reference": "strongswan-libcharon"},
          {"reference": "strongswan-nm"},
          {"reference": "strongswan-pki"},
          {"reference": "strongswan-scepclient"},
          {"reference": "strongswan-starter"},
          {"reference": "strongswan-swanctl"},
          {"reference": "strongswan-tnc-base"},
          {"reference": "strongswan-tnc-client"},
          {"reference": "strongswan-tnc-ifmap"},
          {"reference": "strongswan-tnc-pdp"},
          {"reference": "strongswan-tnc-server"}
        ]
      }
    ]
  }
};

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');
}