Linux Distros Unpatched Vulnerability : CVE-2026-44608

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

include('compat.inc');

if (description)
{
  script_id(315774);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/28");

  script_cve_id("CVE-2026-44608");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-44608");

  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.

  - NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability
    that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-
    nsdname' triggers) it could result in heap use-after-free and eventual crash. An adversary can exploit the
    vulnerability if conditions are first met on a vulnerable Unbound, i.e., multi-threaded, an RPZ zone with
    'rpz-nsip'/'rpz-nsdname' triggers and an ongoing XFR for that RPZ zone. Local RPZ files do not trigger the
    vulnerability. If the timing is right and an XFR happens at the same time another thread needs to read
    that RPZ zone, the reader may not hold the lock long enough and the thread applying the XFR may free
    objects that the reader is about to walk causing the use-after-free. Unbound 1.25.1 contains a patch with
    a fix to the locking code. (CVE-2026-44608)

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-2026-44608");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44608");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-44608");
  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:M/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:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/U:Amber");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-44608");

  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:"2026/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-anchor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-dracut");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:unbound-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-anchor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-dracut");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:unbound-utils");
  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/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-6", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-16.04");

  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/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "libunbound-dev"},
          {"reference": "libunbound8"},
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-anchor"},
          {"reference": "unbound-host"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libunbound-dev"},
          {"reference": "libunbound8"},
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-anchor"},
          {"reference": "unbound-host"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libunbound-dev"},
          {"reference": "libunbound2"},
          {"reference": "python-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-anchor"},
          {"reference": "unbound-host"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-anchor"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-dracut"},
          {"reference": "unbound-libs"},
          {"reference": "unbound-utils"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-libs"},
          {"reference": "unbound-python"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-libs"},
          {"reference": "unbound-python"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-libs"},
          {"reference": "unbound-python"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-libs"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-libs"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "python3-unbound"},
          {"reference": "unbound"},
          {"reference": "unbound-devel"},
          {"reference": "unbound-dracut"},
          {"reference": "unbound-libs"}
        ]
      }
    ]
  }
};

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}