Linux Distros Unpatched Vulnerability : CVE-2026-91403

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

include('compat.inc');

if (description)
{
  script_id(370527);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/23");

  script_cve_id("CVE-2026-91403");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-91403");

  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 the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of
    Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 8u511,
    8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; Oracle GraalVM for JDK: 17.0.21 and 21.0.13; Oracle
    GraalVM Enterprise Edition: 21.3.20. Easily exploitable vulnerability allows unauthenticated attacker with
    network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM
    Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized creation, deletion
    or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM
    Enterprise Edition accessible data as well as unauthorized access to critical data or complete access to
    all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This
    vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which
    supplies data to the APIs. This vulnerability also 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. (CVE-2026-91403)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-91403");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-91403");
  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:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-91403");

  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:"2026/10/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/22");

  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:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  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-27");
  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:"cpe", value:"p-cpe:/a:debian:debian_linux:openjdk-17");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openjdk-21");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openjdk-25");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openjdk-27");
  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/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "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 = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "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"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"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-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-source"},
          {"reference": "openjdk-25-testsupport"},
          {"reference": "openjdk-27-dbg"},
          {"reference": "openjdk-27-demo"},
          {"reference": "openjdk-27-doc"},
          {"reference": "openjdk-27-jdk"},
          {"reference": "openjdk-27-jdk-headless"},
          {"reference": "openjdk-27-jre"},
          {"reference": "openjdk-27-jre-headless"},
          {"reference": "openjdk-27-jre-zero"},
          {"reference": "openjdk-27-source"},
          {"reference": "openjdk-27-testsupport"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"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-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-source"},
          {"reference": "openjdk-25-testsupport"}
        ]
      }
    ]
  },
  "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');
}