Linux Distros Unpatched Vulnerability : CVE-2026-1933

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

include('compat.inc');

if (description)
{
  script_id(316851);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/03");

  script_cve_id("CVE-2026-1933");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-1933");

  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.

  - A flaw was found in Samba's handling of NTFS-style reparse points on shares configured with read only =
    yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write
    permissions may create or delete reparse point metadata through SMB operations even on read-only exports.
    This could allow modification of SMB-visible file behavior, including converting files into symbolic links
    or other reparse point types. (CVE-2026-1933)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-1933");
  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:S/C:N/I:C/A:N");
  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:L/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-1933");

  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:"plugin_publication_date", value:"2026/05/27");

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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-vfs-iouring");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winexe");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ctdb-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ldb-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libldb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libldb-devel");
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  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/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  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/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-ldb"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-devel"},
          {"reference": "ctdb-tests"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-python"},
          {"reference": "samba-python-test"},
          {"reference": "samba-test"},
          {"reference": "samba-test-devel"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-vfs-glusterfs"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-devel"},
          {"reference": "ctdb-tests"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-python"},
          {"reference": "samba-python-test"},
          {"reference": "samba-test"},
          {"reference": "samba-test-devel"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-vfs-glusterfs"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-tests"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "ctdb-tests"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "ctdb"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"}
        ]
      }
    ]
  }
};

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');
}