Linux Distros Unpatched Vulnerability : CVE-2026-120757

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

include('compat.inc');

if (description)
{
  script_id(376178);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/04");

  script_cve_id("CVE-2026-120757");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-120757");

  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.

  - HDF5 through 2.2.0 contains a heap buffer over-read vulnerability in H5L__extern_traverse() in
    src/H5Lexternal.c, the default traversal callback for external links. The callback locates the target file
    name and object path within the link's user data using strlen() without validating the buffer against its
    stored size (udata_size, which was marked unused). A crafted HDF5 file containing an external link whose
    data is not NULL-terminated, or is too short to hold both strings, causes strlen() to read past the end of
    the udata heap buffer, and the derived object path pointer may also point outside the buffer. The overrun
    is unbounded and continues until a zero byte is found. The flaw is triggered when the malicious link is
    traversed, for example when opening an object through it. An attacker who can get a user or application to
    access a crafted file can cause a denial of service, and adjacent heap contents may be incorporated into
    the external file name or object path the library attempts to open. (CVE-2026-120757)

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-2026-120757");
  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:M/Au:N/C:P/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:L/AC:L/PR:N/UI:R/S:U/C:H/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:L/AC:L/AT:N/PR:N/UI:P/VC:L/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-2026-120757");

  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:"2026/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:debian:debian_linux:hdf5");
  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-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14");

  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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "hdf5-helpers"},
          {"reference": "hdf5-tools"},
          {"reference": "libhdf5-103"},
          {"reference": "libhdf5-103-1"},
          {"reference": "libhdf5-cpp-103"},
          {"reference": "libhdf5-cpp-103-1"},
          {"reference": "libhdf5-dev"},
          {"reference": "libhdf5-doc"},
          {"reference": "libhdf5-fortran-102"},
          {"reference": "libhdf5-hl-100"},
          {"reference": "libhdf5-hl-cpp-100"},
          {"reference": "libhdf5-hl-fortran-100"},
          {"reference": "libhdf5-java"},
          {"reference": "libhdf5-jni"},
          {"reference": "libhdf5-mpi-dev"},
          {"reference": "libhdf5-mpich-103"},
          {"reference": "libhdf5-mpich-103-1"},
          {"reference": "libhdf5-mpich-cpp-103-1"},
          {"reference": "libhdf5-mpich-dev"},
          {"reference": "libhdf5-mpich-fortran-102"},
          {"reference": "libhdf5-mpich-hl-100"},
          {"reference": "libhdf5-mpich-hl-cpp-100"},
          {"reference": "libhdf5-mpich-hl-fortran-100"},
          {"reference": "libhdf5-openmpi-103"},
          {"reference": "libhdf5-openmpi-103-1"},
          {"reference": "libhdf5-openmpi-cpp-103-1"},
          {"reference": "libhdf5-openmpi-dev"},
          {"reference": "libhdf5-openmpi-fortran-102"},
          {"reference": "libhdf5-openmpi-hl-100"},
          {"reference": "libhdf5-openmpi-hl-cpp-100"},
          {"reference": "libhdf5-openmpi-hl-fortran-100"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "hdf5-helpers"},
          {"reference": "hdf5-tools"},
          {"reference": "libhdf5-320"},
          {"reference": "libhdf5-cpp-320"},
          {"reference": "libhdf5-dev"},
          {"reference": "libhdf5-doc"},
          {"reference": "libhdf5-fortran-320"},
          {"reference": "libhdf5-hl-320"},
          {"reference": "libhdf5-hl-cpp-320"},
          {"reference": "libhdf5-hl-fortran-320"},
          {"reference": "libhdf5-java"},
          {"reference": "libhdf5-jni"},
          {"reference": "libhdf5-mpi-dev"},
          {"reference": "libhdf5-mpich-320"},
          {"reference": "libhdf5-mpich-cpp-320"},
          {"reference": "libhdf5-mpich-dev"},
          {"reference": "libhdf5-mpich-fortran-320"},
          {"reference": "libhdf5-mpich-hl-320"},
          {"reference": "libhdf5-mpich-hl-cpp-320"},
          {"reference": "libhdf5-mpich-hl-fortran-320"},
          {"reference": "libhdf5-openmpi-320"},
          {"reference": "libhdf5-openmpi-cpp-320"},
          {"reference": "libhdf5-openmpi-dev"},
          {"reference": "libhdf5-openmpi-fortran-320"},
          {"reference": "libhdf5-openmpi-hl-320"},
          {"reference": "libhdf5-openmpi-hl-cpp-320"},
          {"reference": "libhdf5-openmpi-hl-fortran-320"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "hdf5-helpers"},
          {"reference": "hdf5-tools"},
          {"reference": "libhdf5-310"},
          {"reference": "libhdf5-cpp-310"},
          {"reference": "libhdf5-dev"},
          {"reference": "libhdf5-doc"},
          {"reference": "libhdf5-fortran-310"},
          {"reference": "libhdf5-hl-310"},
          {"reference": "libhdf5-hl-cpp-310"},
          {"reference": "libhdf5-hl-fortran-310"},
          {"reference": "libhdf5-java"},
          {"reference": "libhdf5-jni"},
          {"reference": "libhdf5-mpi-dev"},
          {"reference": "libhdf5-mpich-310"},
          {"reference": "libhdf5-mpich-cpp-310"},
          {"reference": "libhdf5-mpich-dev"},
          {"reference": "libhdf5-mpich-fortran-310"},
          {"reference": "libhdf5-mpich-hl-310"},
          {"reference": "libhdf5-mpich-hl-cpp-310"},
          {"reference": "libhdf5-mpich-hl-fortran-310"},
          {"reference": "libhdf5-openmpi-310"},
          {"reference": "libhdf5-openmpi-cpp-310"},
          {"reference": "libhdf5-openmpi-dev"},
          {"reference": "libhdf5-openmpi-fortran-310"},
          {"reference": "libhdf5-openmpi-hl-310"},
          {"reference": "libhdf5-openmpi-hl-cpp-310"},
          {"reference": "libhdf5-openmpi-hl-fortran-310"}
        ]
      }
    ]
  }
};

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');
}