Linux Distros Unpatched Vulnerability : CVE-2026-40253

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

include('compat.inc');

if (description)
{
  script_id(307346);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2026-40253");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-40253");

  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.

  - openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below,
    the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer
    length parameter, and trust attacker-controlled BER length fields without validating them against actual
    buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE,
    ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER
    can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-
    encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token
    loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token
    backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A
    patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3. (CVE-2026-40253)

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-2026-40253");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40253");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-40253");
  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:P/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-40253");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:25.10");
  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:redhat:enterprise_linux:9");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:opencryptoki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:opencryptoki-ccatok");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:opencryptoki-swtok");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:opencryptoki-tpmtok");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:opencryptoki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:opencryptoki");
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  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-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "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");

  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": "libopencryptoki-dev"},
          {"reference": "libopencryptoki0"},
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libopencryptoki-dev"},
          {"reference": "libopencryptoki0"},
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libopencryptoki-dev"},
          {"reference": "libopencryptoki0"},
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "libopencryptoki-dev"},
          {"reference": "libopencryptoki0"},
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "opencryptoki"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"},
          {"reference": "opencryptoki-tpmtok"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"},
          {"reference": "opencryptoki-tpmtok"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"},
          {"reference": "opencryptoki-tpmtok"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "opencryptoki"},
          {"reference": "opencryptoki-ccatok"},
          {"reference": "opencryptoki-devel"},
          {"reference": "opencryptoki-ep11tok"},
          {"reference": "opencryptoki-icatok"},
          {"reference": "opencryptoki-icsftok"},
          {"reference": "opencryptoki-libs"},
          {"reference": "opencryptoki-swtok"},
          {"reference": "opencryptoki-tpmtok"}
        ]
      }
    ]
  }
};

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');
}