Linux Distros Unpatched Vulnerability : CVE-2026-43106

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

include('compat.inc');

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  script_id(313148);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/29");

  script_cve_id("CVE-2026-43106");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-43106");

  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.

  - In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix incorrect dentry
    refcount in cachefiles_cull() The patch mentioned below changed cachefiles_bury_object() to expect 2
    references to the 'rep' dentry. Three of the callers were changed to use start_removing_dentry() which
    takes an extra reference so in those cases the call gets the expected references. However there is another
    call to cachefiles_bury_object() in cachefiles_cull() which did not need to be changed to use
    start_removing_dentry() and so was not properly considered. It still passed the dentry with just one
    reference so the net result is that a reference is lost. To meet the expectations of
    cachefiles_bury_object(), cachefiles_cull() must take an extra reference before the call. It will be
    dropped by cachefiles_bury_object(). (CVE-2026-43106)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  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:L/AC:L/Au:N/C:P/I:P/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC: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_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-43106");

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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/07");

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  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");
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}

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 = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
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          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
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          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
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          {"reference": "linux-gke-4.15"},
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          {"reference": "linux-gkeop-5.4"},
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          {"reference": "linux-image-4.15.0"},
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          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-oem"}
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          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-lib-rust-7.0.0"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"reference": "linux-udebs-azure-fde"}
        ]
      }
    ]
  }
};

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 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');
}