Linux Distros Unpatched Vulnerability : CVE-2026-85088

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

include('compat.inc');

if (description)
{
  script_id(362720);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/03");

  script_cve_id("CVE-2026-85088");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-85088");

  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.

  - Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift. Both
    libraries install a default access manager for client sockets  TSSLSocketFactory does so in C++, and the
    accessManager property does so in D  which compares the peer certificate against the host name that was
    connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate
    Common Name afterwards. A name that does not match yields a skip result rather than a rejection, so a
    certificate whose subjectAltName entries are all present and all non-matching falls through to the Common
    Name, which can then satisfy the check. RFC 6125 section 6.4.4, and RFC 9525 section 2, require that the
    Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying
    subjectAltName entries for one name and a Common Name for another is therefore accepted for a connection
    to the second name. Exploitation requires an attacker positioned on the network path who holds a
    certificate that chains to a certificate authority in the client's trust store and whose Common Name
    matches the connected host name. Public certificate authorities have not issued on Common Name alone for
    many years, so this is principally a concern for deployments using a private or enterprise public-key
    infrastructure. This issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D
    library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0. (CVE-2026-85088)

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-2026-85088");
  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:P/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: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:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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-2026-85088");

  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:"2026/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/03");

  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:thrift");
  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": "golang-thrift-dev"},
          {"reference": "libthrift-0.17.0"},
          {"reference": "libthrift-c-glib-dev"},
          {"reference": "libthrift-c-glib0"},
          {"reference": "libthrift-dev"},
          {"reference": "libthrift-perl"},
          {"reference": "php-thrift"},
          {"reference": "python3-thrift"},
          {"reference": "thrift-compiler"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "golang-thrift-dev"},
          {"reference": "libthrift-0.23.0"},
          {"reference": "libthrift-c-glib-dev"},
          {"reference": "libthrift-c-glib0t64"},
          {"reference": "libthrift-dev"},
          {"reference": "libthrift-perl"},
          {"reference": "php-thrift"},
          {"reference": "python3-thrift"},
          {"reference": "thrift-compiler"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "golang-thrift-dev"},
          {"reference": "libthrift-0.19.0t64"},
          {"reference": "libthrift-c-glib-dev"},
          {"reference": "libthrift-c-glib0t64"},
          {"reference": "libthrift-dev"},
          {"reference": "libthrift-perl"},
          {"reference": "php-thrift"},
          {"reference": "python3-thrift"},
          {"reference": "thrift-compiler"}
        ]
      }
    ]
  }
};

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');
}