Microsoft Windows Subsystem for Linux (WSL2) < 2.7.8 EoP (CVE-2026-57968) (July 2026)

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

include('compat.inc');

if (description)
{
  script_id(326852);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/14");

  script_cve_id("CVE-2026-57968");

  script_name(english:"Microsoft Windows Subsystem for Linux (WSL2) < 2.7.8 EoP (CVE-2026-57968) (July 2026)");

  script_set_attribute(attribute:"synopsis", value:
"Microsoft Windows Subsystem for Linux (WSL2) is affected by an elevation of privilege vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft Windows Subsystem for Linux (WSL2) on the remote Windows host is prior to 2.7.8. It is,
therefore, affected by an elevation of privilege vulnerability:

  - Buffer over-read in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.
    (CVE-2026-57968)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57968
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?93634d4e");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Microsoft Windows Subsystem for Linux (WSL2) version 2.7.8 or later via the Microsoft Store.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-57968");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:windows_subsystem_for_linux");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("wmi_enum_windows_app_store.nbin");
  script_require_keys("installed_sw/MicrosoftCorporationII.WindowsSubsystemForLinux");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'MicrosoftCorporationII.WindowsSubsystemForLinux', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '2.7.8'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);