Linux Distros Unpatched Vulnerability : CVE-2026-93683

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

include('compat.inc');

if (description)
{
  script_id(365738);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/14");

  script_cve_id("CVE-2026-93683");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-93683");

  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 the DPDK vhost library. When handling a virtio indirect descriptor table, the host
    reads the table length more than once from guest memory and can allocate a host copy before validating
    that length. A guest that changes the length between those reads, or that supplies an out-of-range next
    index on a small host copy in the vDPA relay path, can cause the host vhost process to walk past the
    validated mapping or heap copy. That can crash or disrupt the vhost process. Out-of-bounds bytes are
    consumed as descriptor fields for GPA translation and are not returned to the guest as payload. This is a
    residual issue in the non-contiguous indirect descriptor copy path introduced as part of the CVE-2018-1059
    fix. (CVE-2026-93683)

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-2026-93683");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-93683");
  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:P");
  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:L/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-93683");

  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:"2026/10/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  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:"cpe:/o:redhat:enterprise_linux:10");
  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:centos:centos:dpdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dpdk-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dpdk-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dpdk-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:driverctl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dpdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dpdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dpdk-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dpdk-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dpdk-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:driverctl");
  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-8", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "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/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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-dev"},
          {"reference": "dpdk-doc"},
          {"reference": "libdpdk-dev"},
          {"reference": "librte-acl23"},
          {"reference": "librte-baseband-acc23"},
          {"reference": "librte-baseband-fpga-5gnr-fec23"},
          {"reference": "librte-baseband-fpga-lte-fec23"},
          {"reference": "librte-baseband-la12xx23"},
          {"reference": "librte-baseband-null23"},
          {"reference": "librte-baseband-turbo-sw23"},
          {"reference": "librte-bbdev23"},
          {"reference": "librte-bitratestats23"},
          {"reference": "librte-bpf23"},
          {"reference": "librte-bus-auxiliary23"},
          {"reference": "librte-bus-dpaa23"},
          {"reference": "librte-bus-fslmc23"},
          {"reference": "librte-bus-ifpga23"},
          {"reference": "librte-bus-pci23"},
          {"reference": "librte-bus-vdev23"},
          {"reference": "librte-bus-vmbus23"},
          {"reference": "librte-cfgfile23"},
          {"reference": "librte-cmdline23"},
          {"reference": "librte-common-cnxk23"},
          {"reference": "librte-common-cpt23"},
          {"reference": "librte-common-dpaax23"},
          {"reference": "librte-common-iavf23"},
          {"reference": "librte-common-idpf23"},
          {"reference": "librte-common-mlx5-23"},
          {"reference": "librte-common-octeontx23"},
          {"reference": "librte-common-qat23"},
          {"reference": "librte-common-sfc-efx23"},
          {"reference": "librte-compress-isal23"},
          {"reference": "librte-compress-mlx5-23"},
          {"reference": "librte-compress-octeontx23"},
          {"reference": "librte-compressdev23"},
          {"reference": "librte-meta-all"},
          {"reference": "librte-meta-allpmds"},
          {"reference": "librte-meta-baseband"},
          {"reference": "librte-meta-bus"},
          {"reference": "librte-meta-common"},
          {"reference": "librte-meta-compress"},
          {"reference": "librte-meta-crypto"},
          {"reference": "librte-meta-dma"},
          {"reference": "librte-meta-event"},
          {"reference": "librte-meta-mempool"},
          {"reference": "librte-meta-net"},
          {"reference": "librte-meta-raw"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-dev"},
          {"reference": "dpdk-doc"},
          {"reference": "libdpdk-dev"},
          {"reference": "librte-acl26"},
          {"reference": "librte-argparse26"},
          {"reference": "librte-baseband-acc26"},
          {"reference": "librte-baseband-fpga-5gnr-fec26"},
          {"reference": "librte-baseband-fpga-lte-fec26"},
          {"reference": "librte-baseband-la12xx26"},
          {"reference": "librte-baseband-null26"},
          {"reference": "librte-baseband-turbo-sw26"},
          {"reference": "librte-bbdev26"},
          {"reference": "librte-bitratestats26"},
          {"reference": "librte-bpf26"},
          {"reference": "librte-bus-auxiliary26"},
          {"reference": "librte-bus-cdx26"},
          {"reference": "librte-bus-dpaa26"},
          {"reference": "librte-bus-fslmc26"},
          {"reference": "librte-bus-ifpga26"},
          {"reference": "librte-bus-pci26"},
          {"reference": "librte-bus-platform26"},
          {"reference": "librte-bus-uacce26"},
          {"reference": "librte-bus-vdev26"},
          {"reference": "librte-bus-vmbus26"},
          {"reference": "librte-cfgfile26"},
          {"reference": "librte-cmdline26"},
          {"reference": "librte-common-cnxk26"},
          {"reference": "librte-common-cpt26"},
          {"reference": "librte-common-dpaax26"},
          {"reference": "librte-common-ionic26"},
          {"reference": "librte-common-mlx5-26"},
          {"reference": "librte-common-nfp26"},
          {"reference": "librte-common-nitrox26"},
          {"reference": "librte-common-octeontx26"},
          {"reference": "librte-common-qat26"},
          {"reference": "librte-meta-all"},
          {"reference": "librte-meta-allpmds"},
          {"reference": "librte-meta-baseband"},
          {"reference": "librte-meta-bus"},
          {"reference": "librte-meta-common"},
          {"reference": "librte-meta-compress"},
          {"reference": "librte-meta-crypto"},
          {"reference": "librte-meta-dma"},
          {"reference": "librte-meta-event"},
          {"reference": "librte-meta-mempool"},
          {"reference": "librte-meta-net"},
          {"reference": "librte-meta-raw"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-dev"},
          {"reference": "dpdk-doc"},
          {"reference": "libdpdk-dev"},
          {"reference": "librte-acl25"},
          {"reference": "librte-argparse25"},
          {"reference": "librte-baseband-acc25"},
          {"reference": "librte-baseband-fpga-5gnr-fec25"},
          {"reference": "librte-baseband-fpga-lte-fec25"},
          {"reference": "librte-baseband-la12xx25"},
          {"reference": "librte-baseband-null25"},
          {"reference": "librte-baseband-turbo-sw25"},
          {"reference": "librte-bbdev25"},
          {"reference": "librte-bitratestats25"},
          {"reference": "librte-bpf25"},
          {"reference": "librte-bus-auxiliary25"},
          {"reference": "librte-bus-cdx25"},
          {"reference": "librte-bus-dpaa25"},
          {"reference": "librte-bus-fslmc25"},
          {"reference": "librte-bus-ifpga25"},
          {"reference": "librte-bus-pci25"},
          {"reference": "librte-bus-platform25"},
          {"reference": "librte-bus-uacce25"},
          {"reference": "librte-bus-vdev25"},
          {"reference": "librte-bus-vmbus25"},
          {"reference": "librte-cfgfile25"},
          {"reference": "librte-cmdline25"},
          {"reference": "librte-common-cnxk25"},
          {"reference": "librte-common-cpt25"},
          {"reference": "librte-common-dpaax25"},
          {"reference": "librte-common-iavf25"},
          {"reference": "librte-common-idpf25"},
          {"reference": "librte-common-ionic25"},
          {"reference": "librte-common-mlx5-25"},
          {"reference": "librte-common-nfp25"},
          {"reference": "librte-common-nitrox25"},
          {"reference": "librte-meta-all"},
          {"reference": "librte-meta-allpmds"},
          {"reference": "librte-meta-baseband"},
          {"reference": "librte-meta-bus"},
          {"reference": "librte-meta-common"},
          {"reference": "librte-meta-compress"},
          {"reference": "librte-meta-crypto"},
          {"reference": "librte-meta-dma"},
          {"reference": "librte-meta-event"},
          {"reference": "librte-meta-mempool"},
          {"reference": "librte-meta-net"},
          {"reference": "librte-meta-raw"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-devel"},
          {"reference": "dpdk-doc"},
          {"reference": "dpdk-tools"},
          {"reference": "driverctl"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-devel"},
          {"reference": "dpdk-doc"},
          {"reference": "dpdk-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-devel"},
          {"reference": "dpdk-doc"},
          {"reference": "dpdk-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "dpdk"},
          {"reference": "dpdk-devel"},
          {"reference": "dpdk-doc"},
          {"reference": "dpdk-tools"}
        ]
      }
    ]
  }
};

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