Linux Distros Unpatched Vulnerability : CVE-2026-12064

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

include('compat.inc');

if (description)
{
  script_id(322467);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/29");

  script_cve_id("CVE-2026-12064");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-12064");

  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.

  - Debian Linux - curl - None  Ubuntu Linux - When a user invokes curl using a schemeless URL combined with
    `--proto-default` sftp (or scp), a disconnect occurs between the tool layer and libcurl. The tool layer
    incorrectly infers the URL scheme, which erroneously bypasses the initialization of critical SSH security
    options like CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the libcurl
    runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes the connection via SFTP/SCP as
    specified. Because the tool layer skipped the security configuration, these SSH host verification options
    are silently omitted, causing curl to connect to an unverified SSH remote host without throwing an error.
    (CVE-2026-12064)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-12064");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-12064");
  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:P/A:N");
  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:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-12064");

  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:"2026/06/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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: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:"p-cpe:/a:canonical:ubuntu_linux:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:curl");
  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/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "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/Debian/dpkg-l"))) 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": "curl"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3-gnutls"},
          {"reference": "libcurl3-nss"},
          {"reference": "libcurl4"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-nss-dev"},
          {"reference": "libcurl4-openssl-dev"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "curl"},
          {"reference": "libcurl3t64-gnutls"},
          {"reference": "libcurl4-doc"},
          {"reference": "libcurl4-gnutls-dev"},
          {"reference": "libcurl4-openssl-dev"},
          {"reference": "libcurl4t64"}
        ]
      }
    ]
  }
};

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');
}