Linux Distros Unpatched Vulnerability : CVE-2026-5950

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

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  script_cve_id("CVE-2026-5950");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-5950");

  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.

  - An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server
    handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending
    queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through
    9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1
    through 9.20.22-S1. (CVE-2026-5950)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
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  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/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "11",
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          {"reference": "bind9-host"},
          {"reference": "bind9-libs"},
          {"reference": "bind9-utils"},
          {"reference": "bind9utils"},
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  "Ubuntu Linux-14.04": {
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  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "bind"},
          {"reference": "bind-chroot"},
          {"reference": "bind-devel"},
          {"reference": "bind-export-devel"},
          {"reference": "bind-export-libs"},
          {"reference": "bind-libs"},
          {"reference": "bind-libs-lite"},
          {"reference": "bind-license"},
          {"reference": "bind-lite-devel"},
          {"reference": "bind-pkcs11"},
          {"reference": "bind-pkcs11-devel"},
          {"reference": "bind-pkcs11-libs"},
          {"reference": "bind-pkcs11-utils"},
          {"reference": "bind-sdb"},
          {"reference": "bind-sdb-chroot"},
          {"reference": "bind-utils"},
          {"reference": "bind9.16"},
          {"reference": "bind9.16-chroot"},
          {"reference": "bind9.16-devel"},
          {"reference": "bind9.16-dnssec-utils"},
          {"reference": "bind9.16-doc"},
          {"reference": "bind9.16-libs"},
          {"reference": "bind9.16-license"},
          {"reference": "bind9.16-utils"},
          {"reference": "python3-bind"},
          {"reference": "python3-bind9.16"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "bind"},
          {"reference": "bind-chroot"},
          {"reference": "bind-devel"},
          {"reference": "bind-export-devel"},
          {"reference": "bind-export-libs"},
          {"reference": "bind-libs"},
          {"reference": "bind-libs-lite"},
          {"reference": "bind-license"},
          {"reference": "bind-lite-devel"},
          {"reference": "bind-pkcs11"},
          {"reference": "bind-pkcs11-devel"},
          {"reference": "bind-pkcs11-libs"},
          {"reference": "bind-pkcs11-utils"},
          {"reference": "bind-sdb"},
          {"reference": "bind-sdb-chroot"},
          {"reference": "bind-utils"},
          {"reference": "bind9.16"},
          {"reference": "bind9.16-chroot"},
          {"reference": "bind9.16-devel"},
          {"reference": "bind9.16-dnssec-utils"},
          {"reference": "bind9.16-doc"},
          {"reference": "bind9.16-libs"},
          {"reference": "bind9.16-license"},
          {"reference": "bind9.16-utils"},
          {"reference": "python3-bind"},
          {"reference": "python3-bind9.16"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "bind"},
          {"reference": "bind-chroot"},
          {"reference": "bind-devel"},
          {"reference": "bind-dnssec-doc"},
          {"reference": "bind-dnssec-utils"},
          {"reference": "bind-doc"},
          {"reference": "bind-libs"},
          {"reference": "bind-license"},
          {"reference": "bind-utils"},
          {"reference": "bind9.18"},
          {"reference": "bind9.18-chroot"},
          {"reference": "bind9.18-devel"},
          {"reference": "bind9.18-dnssec-utils"},
          {"reference": "bind9.18-doc"},
          {"reference": "bind9.18-libs"},
          {"reference": "bind9.18-utils"},
          {"reference": "dhcp"},
          {"reference": "dhcp-client"},
          {"reference": "dhcp-common"},
          {"reference": "dhcp-relay"},
          {"reference": "dhcp-server"},
          {"reference": "python3-bind"}
        ]
      }
    ]
  }
};

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');
}