Linux Distros Unpatched Vulnerability : CVE-2026-64473

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

include('compat.inc');

if (description)
{
  script_id(329761);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/25");

  script_cve_id("CVE-2026-64473");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-64473");

  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.

  - vfio: Remove device debugfs before releasing devres VFIO device debugfs files created with
    debugfs_create_devm_seqfile() store a devres allocated debugfs_devm_entry as inode private data.
    vfio_unregister_group_dev() currently calls vfio_device_del() before vfio_device_debugfs_exit(), but
    device_del() releases devres. This can leave debugfs entries visible with stale inode private data while
    unregister waits for userspace references to drain. Remove the per-device debugfs tree before
    vfio_device_del(). The debugfs view is diagnostic only, so losing it at the start of unregister is
    preferable to preserving entries whose backing storage may already have been released. Complete the
    teardown by clearing the per-device debugfs root after removal. This matches the global debugfs root
    cleanup and prevents future users from mistaking a removed dentry for a live debugfs tree during the
    remainder of unregister. (CVE-2026-64473)

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-2026-64473");
  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:"cvss_score_source", value:"CVE-2026-64473");

  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:"2026/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:linux");
  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-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-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "hyperv-daemons"},
          {"reference": "intel-sdsi"},
          {"reference": "libcpupower-dev"},
          {"reference": "libcpupower1"},
          {"reference": "linux-base-7.1.3+deb14-alpha-generic"},
          {"reference": "linux-base-7.1.3+deb14-alpha-smp"},
          {"reference": "linux-base-7.1.3+deb14-amd64"},
          {"reference": "linux-base-7.1.3+deb14-arm64"},
          {"reference": "linux-base-7.1.3+deb14-arm64-16k"},
          {"reference": "linux-base-7.1.3+deb14-armmp"},
          {"reference": "linux-base-7.1.3+deb14-armmp-lpae"},
          {"reference": "linux-base-7.1.3+deb14-cloud-amd64"},
          {"reference": "linux-base-7.1.3+deb14-cloud-arm64"},
          {"reference": "linux-base-7.1.3+deb14-loong64"},
          {"reference": "linux-base-7.1.3+deb14-m68k"},
          {"reference": "linux-base-7.1.3+deb14-parisc"},
          {"reference": "linux-base-7.1.3+deb14-parisc64"},
          {"reference": "linux-base-7.1.3+deb14-powerpc"},
          {"reference": "linux-base-7.1.3+deb14-powerpc-smp"},
          {"reference": "linux-base-7.1.3+deb14-powerpc64"},
          {"reference": "linux-base-7.1.3+deb14-powerpc64-64k"},
          {"reference": "linux-base-7.1.3+deb14-powerpc64le"},
          {"reference": "linux-base-7.1.3+deb14-powerpc64le-64k"},
          {"reference": "linux-base-7.1.3+deb14-riscv64"},
          {"reference": "linux-base-7.1.3+deb14-rt-amd64"},
          {"reference": "linux-base-7.1.3+deb14-rt-arm64"},
          {"reference": "linux-base-7.1.3+deb14-s390x"},
          {"reference": "linux-base-7.1.3+deb14-sh7751r"},
          {"reference": "linux-base-7.1.3+deb14-sparc64"},
          {"reference": "linux-base-7.1.3+deb14-sparc64-smp"},
          {"reference": "linux-base-7.1.3+deb14-test"}
        ]
      }
    ]
  }
};

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');
}