QEMU 8.1.x < 10.0.10 / 10.2.x < 10.2.3 / 11.0.x < 11.0.1 Privilege Escalation

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

include('compat.inc');

if (description)
{
  script_id(320870);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/15");

  script_cve_id("CVE-2026-3886");
  script_xref(name:"IAVB", value:"2026-B-0152");

  script_name(english:"QEMU 8.1.x < 10.0.10 / 10.2.x < 10.2.3 / 11.0.x < 11.0.1 Privilege Escalation");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has virtualization software installed that is affected by a privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of QEMU installed on the remote Windows host is affected by a privilege escalation vulnerability:

  - An integer overflow exists in the calc_image_hostmem function within the virtio-gpu driver due to the lack of
    proper validation of user-supplied data before allocating a buffer. A local attacker who has obtained the ability
    to execute low-privileged code on the target guest system can exploit this to escalate privileges and execute
    arbitrary code in the context of the host system. (CVE-2026-3886)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.zerodayinitiative.com/advisories/ZDI-26-332/");
  # https://patchew.org/QEMU/[email protected]/[email protected]/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f2775493");
  script_set_attribute(attribute:"solution", value:
"Upgrade to QEMU 10.0.10 / 10.2.3 / 11.0.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-3886");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:qemu:qemu");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("qemu_installed_windows.nbin");
  script_require_keys("installed_sw/QEMU");

  exit(0);
}


include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'QEMU', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '8.1.0', 'fixed_version': '10.0.10'},
        {'min_version': '10.2.0', 'fixed_version': '10.2.3'},
        {'min_version': '11.0.0', 'fixed_version': '11.0.1'}
      ]
    }
  ]
};

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