Linux Distros Unpatched Vulnerability : CVE-2026-91484

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

include('compat.inc');

if (description)
{
  script_id(371267);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/23");

  script_cve_id("CVE-2026-91484");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-91484");

  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.

  - Vulnerability in Oracle Java SE (component: Java plugin). Supported versions that are affected are Oracle
    Java SE: 8u503 and 8u503-perf. Difficult to exploit vulnerability allows low privileged attacker with
    logon to the infrastructure where Oracle Java SE executes to compromise Oracle Java SE. While the
    vulnerability is in Oracle Java SE, attacks may significantly impact additional products (scope change).
    Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification
    access to critical data or all Oracle Java SE accessible data as well as unauthorized access to critical
    data or complete access to all Oracle Java SE accessible data. Note: This vulnerability applies to Java
    deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets,
    that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox
    for security. This vulnerability does not apply to Java deployments, typically in servers, that load and
    run only trusted code (e.g., code installed by an administrator). (CVE-2026-91484)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-91484");
  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:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/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-2026-91484");

  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:"2026/10/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/23");

  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:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-16");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-18");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-21");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-25");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-lts");
  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/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04");

  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/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": "openjdk-8-dbg"},
          {"reference": "openjdk-8-demo"},
          {"reference": "openjdk-8-doc"},
          {"reference": "openjdk-8-jdk"},
          {"reference": "openjdk-8-jdk-headless"},
          {"reference": "openjdk-8-jre"},
          {"reference": "openjdk-8-jre-headless"},
          {"reference": "openjdk-8-jre-jamvm"},
          {"reference": "openjdk-8-jre-zero"},
          {"reference": "openjdk-8-source"},
          {"reference": "openjdk-9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "openjdk-11-dbg"},
          {"reference": "openjdk-11-demo"},
          {"reference": "openjdk-11-doc"},
          {"reference": "openjdk-11-jdk"},
          {"reference": "openjdk-11-jdk-headless"},
          {"reference": "openjdk-11-jre"},
          {"reference": "openjdk-11-jre-headless"},
          {"reference": "openjdk-11-jre-zero"},
          {"reference": "openjdk-11-source"},
          {"reference": "openjdk-17"},
          {"reference": "openjdk-8"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "openjdk-11-dbg"},
          {"reference": "openjdk-11-demo"},
          {"reference": "openjdk-11-doc"},
          {"reference": "openjdk-11-jdk"},
          {"reference": "openjdk-11-jdk-headless"},
          {"reference": "openjdk-11-jre"},
          {"reference": "openjdk-11-jre-headless"},
          {"reference": "openjdk-11-jre-zero"},
          {"reference": "openjdk-11-source"},
          {"reference": "openjdk-13"},
          {"reference": "openjdk-16"},
          {"reference": "openjdk-17"},
          {"reference": "openjdk-21"},
          {"reference": "openjdk-8"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "openjdk-11-dbg"},
          {"reference": "openjdk-11-demo"},
          {"reference": "openjdk-11-doc"},
          {"reference": "openjdk-11-jdk"},
          {"reference": "openjdk-11-jdk-headless"},
          {"reference": "openjdk-11-jre"},
          {"reference": "openjdk-11-jre-headless"},
          {"reference": "openjdk-11-jre-zero"},
          {"reference": "openjdk-11-source"},
          {"reference": "openjdk-17"},
          {"reference": "openjdk-18"},
          {"reference": "openjdk-21"},
          {"reference": "openjdk-25"},
          {"reference": "openjdk-8"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "openjdk-17-dbg"},
          {"reference": "openjdk-17-demo"},
          {"reference": "openjdk-17-doc"},
          {"reference": "openjdk-17-jdk"},
          {"reference": "openjdk-17-jdk-headless"},
          {"reference": "openjdk-17-jre"},
          {"reference": "openjdk-17-jre-headless"},
          {"reference": "openjdk-17-jre-zero"},
          {"reference": "openjdk-17-source"},
          {"reference": "openjdk-21-dbg"},
          {"reference": "openjdk-21-demo"},
          {"reference": "openjdk-21-doc"},
          {"reference": "openjdk-21-jdk"},
          {"reference": "openjdk-21-jdk-headless"},
          {"reference": "openjdk-21-jre"},
          {"reference": "openjdk-21-jre-headless"},
          {"reference": "openjdk-21-jre-zero"},
          {"reference": "openjdk-21-source"},
          {"reference": "openjdk-21-testsupport"},
          {"reference": "openjdk-25"},
          {"reference": "openjdk-8"},
          {"reference": "openjdk-lts"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "openjdk-17"},
          {"reference": "openjdk-17-crac"},
          {"reference": "openjdk-21"},
          {"reference": "openjdk-21-crac"},
          {"reference": "openjdk-25-dbg"},
          {"reference": "openjdk-25-demo"},
          {"reference": "openjdk-25-doc"},
          {"reference": "openjdk-25-jdk"},
          {"reference": "openjdk-25-jdk-headless"},
          {"reference": "openjdk-25-jre"},
          {"reference": "openjdk-25-jre-headless"},
          {"reference": "openjdk-25-jre-zero"},
          {"reference": "openjdk-25-jvmci-jdk"},
          {"reference": "openjdk-25-source"},
          {"reference": "openjdk-25-testsupport"},
          {"reference": "openjdk-8"},
          {"reference": "openjdk-lts"}
        ]
      }
    ]
  }
};

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');
}