Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : FluidSynth vulnerabilities (USN-8885-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8885-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(363808);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/07");

  script_cve_id("CVE-2026-58264", "CVE-2026-61714");
  script_xref(name:"IAVB", value:"2026-B-0192");
  script_xref(name:"USN", value:"8885-1");

  script_name(english:"Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : FluidSynth vulnerabilities (USN-8885-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by multiple vulnerabilities as referenced in the USN-8885-1 advisory.

    It was discovered that FluidSynth did not properly validate the channel argument of the pitch_bend_range
    command. A remote attacker could possibly use this issue to cause FluidSynth to crash, resulting in a
    denial of service, or execute arbitrary code. (CVE-2026-58264)

    It was discovered that FluidSynth incorrectly handled configurations with more than 16 MIDI channels in
    its MIDI player, leading to a heap buffer overflow. An attacker could possibly use this issue to cause
    FluidSynth to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected
    Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-61714)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-8885-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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: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:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-58264");

  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:"2026/07/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-: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:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:fluidsynth");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libfluidsynth1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libfluidsynth2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libfluidsynth3");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 18.04 / 20.04 / 22.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'fluidsynth', 'pkgver': '1.1.6-2ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '14.04', 'pkgname': 'libfluidsynth1', 'pkgver': '1.1.6-2ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '18.04', 'pkgname': 'fluidsynth', 'pkgver': '1.1.9-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '18.04', 'pkgname': 'libfluidsynth1', 'pkgver': '1.1.9-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '20.04', 'pkgname': 'fluidsynth', 'pkgver': '2.1.1-2ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '20.04', 'pkgname': 'libfluidsynth2', 'pkgver': '2.1.1-2ubuntu0.1~esm1', 'cves': ['CVE-2026-58264']},
    {'osver': '22.04', 'pkgname': 'fluidsynth', 'pkgver': '2.2.5-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']},
    {'osver': '22.04', 'pkgname': 'libfluidsynth3', 'pkgver': '2.2.5-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']},
    {'osver': '24.04', 'pkgname': 'fluidsynth', 'pkgver': '2.3.4-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']},
    {'osver': '24.04', 'pkgname': 'libfluidsynth3', 'pkgver': '2.3.4-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']},
    {'osver': '26.04', 'pkgname': 'fluidsynth', 'pkgver': '2.4.8+dfsg-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']},
    {'osver': '26.04', 'pkgname': 'libfluidsynth3', 'pkgver': '2.4.8+dfsg-1ubuntu0.1~esm1', 'cves': ['CVE-2026-58264', 'CVE-2026-61714']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'fluidsynth / libfluidsynth1 / libfluidsynth2 / libfluidsynth3');
}