Linux Distros Unpatched Vulnerability : CVE-2025-21818

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

include('compat.inc');

if (description)
{
  script_id(231553);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/03/10");

  script_cve_id("CVE-2025-21818");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-21818");

  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.

  - In the Linux kernel, the following vulnerability has been resolved: x86/xen: fix xen_hypercall_hvm() to
    not clobber %rbx xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once
    during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved
    across the call or not, this clobbering might result in an early crash of the system. This can be avoided
    by using an already saved register instead of %rbx. (CVE-2025-21818)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  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:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-21818");

  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:"2025/02/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/Debian/dpkg-l", "Host/Ubuntu", "Host/Ubuntu/release");

  exit(0);
}
include('vdf.inc');

# @tvdl-content
var vuln_data = {
 "metadata": {
  "spec_version": "1.0p"
 },
 "requires": [
  {
   "scope": "scan_config",
   "match": {
    "vendor_unpatched": true
   }
  },
  {
   "scope": "target",
   "match": {
    "os": "linux"
   }
  }
 ],
 "report": {
  "report_type": "unpatched"
 },
 "checks": [
  {
   "product": {
    "name": [
     "linux-aws-cloud-tools-5.15.0-1004",
     "linux-aws-fips",
     "linux-aws-headers-5.15.0-1004",
     "linux-aws-tools-5.15.0-1004",
     "linux-azure-cloud-tools-5.15.0-1003",
     "linux-azure-fde",
     "linux-azure-fips",
     "linux-azure-headers-5.15.0-1003",
     "linux-azure-tools-5.15.0-1003",
     "linux-buildinfo-5.15.0-1002-gke",
     "linux-buildinfo-5.15.0-1002-ibm",
     "linux-buildinfo-5.15.0-1002-oracle",
     "linux-buildinfo-5.15.0-1003-azure",
     "linux-buildinfo-5.15.0-1003-gcp",
     "linux-buildinfo-5.15.0-1004-aws",
     "linux-buildinfo-5.15.0-1004-kvm",
     "linux-buildinfo-5.15.0-1005-raspi",
     "linux-buildinfo-5.15.0-1005-raspi-nolpae",
     "linux-buildinfo-5.15.0-24-lowlatency",
     "linux-buildinfo-5.15.0-24-lowlatency-64k",
     "linux-buildinfo-5.15.0-25-generic",
     "linux-buildinfo-5.15.0-25-generic-64k",
     "linux-cloud-tools-5.15.0-1002-ibm",
     "linux-cloud-tools-5.15.0-1002-oracle",
     "linux-cloud-tools-5.15.0-1003-azure",
     "linux-cloud-tools-5.15.0-1004-aws",
     "linux-cloud-tools-5.15.0-1004-kvm",
     "linux-cloud-tools-5.15.0-24-lowlatency",
     "linux-cloud-tools-5.15.0-24-lowlatency-64k",
     "linux-cloud-tools-5.15.0-25",
     "linux-cloud-tools-5.15.0-25-generic",
     "linux-cloud-tools-5.15.0-25-generic-64k",
     "linux-cloud-tools-common",
     "linux-doc",
     "linux-fips",
     "linux-gcp-fips",
     "linux-gcp-headers-5.15.0-1003",
     "linux-gcp-tools-5.15.0-1003",
     "linux-gke-headers-5.15.0-1002",
     "linux-gke-tools-5.15.0-1002",
     "linux-gkeop",
     "linux-headers-5.15.0-1002-gke",
     "linux-headers-5.15.0-1002-ibm",
     "linux-headers-5.15.0-1002-oracle",
     "linux-headers-5.15.0-1003-azure",
     "linux-headers-5.15.0-1003-gcp",
     "linux-headers-5.15.0-1004-aws",
     "linux-headers-5.15.0-1004-kvm",
     "linux-headers-5.15.0-1005-raspi",
     "linux-headers-5.15.0-1005-raspi-nolpae",
     "linux-headers-5.15.0-24-lowlatency",
     "linux-headers-5.15.0-24-lowlatency-64k",
     "linux-headers-5.15.0-25",
     "linux-headers-5.15.0-25-generic",
     "linux-headers-5.15.0-25-generic-64k",
     "linux-headers-5.15.0-25-generic-lpae",
     "linux-ibm-cloud-tools-5.15.0-1002",
     "linux-ibm-cloud-tools-common",
     "linux-ibm-headers-5.15.0-1002",
     "linux-ibm-source-5.15.0",
     "linux-ibm-tools-5.15.0-1002",
     "linux-ibm-tools-common",
     "linux-image-5.15.0-1005-raspi",
     "linux-image-5.15.0-1005-raspi-dbgsym",
     "linux-image-5.15.0-1005-raspi-nolpae",
     "linux-image-5.15.0-1005-raspi-nolpae-dbgsym",
     "linux-image-unsigned-5.15.0-1002-gke",
     "linux-image-unsigned-5.15.0-1002-gke-dbgsym",
     "linux-image-unsigned-5.15.0-1002-ibm",
     "linux-image-unsigned-5.15.0-1002-ibm-dbgsym",
     "linux-image-unsigned-5.15.0-1002-oracle",
     "linux-image-unsigned-5.15.0-1002-oracle-dbgsym",
     "linux-image-unsigned-5.15.0-1003-azure",
     "linux-image-unsigned-5.15.0-1003-azure-dbgsym",
     "linux-image-unsigned-5.15.0-1003-gcp",
     "linux-image-unsigned-5.15.0-1003-gcp-dbgsym",
     "linux-image-unsigned-5.15.0-1004-aws",
     "linux-image-unsigned-5.15.0-1004-aws-dbgsym",
     "linux-image-unsigned-5.15.0-1004-kvm",
     "linux-image-unsigned-5.15.0-1004-kvm-dbgsym",
     "linux-image-unsigned-5.15.0-24-lowlatency",
     "linux-image-unsigned-5.15.0-24-lowlatency-64k",
     "linux-image-unsigned-5.15.0-24-lowlatency-64k-dbgsym",
     "linux-image-unsigned-5.15.0-24-lowlatency-dbgsym",
     "linux-image-unsigned-5.15.0-25-generic",
     "linux-image-unsigned-5.15.0-25-generic-64k",
     "linux-image-unsigned-5.15.0-25-generic-64k-dbgsym",
     "linux-image-unsigned-5.15.0-25-generic-dbgsym",
     "linux-image-unsigned-5.15.0-25-generic-lpae",
     "linux-kvm-cloud-tools-5.15.0-1004",
     "linux-kvm-headers-5.15.0-1004",
     "linux-kvm-tools-5.15.0-1004",
     "linux-libc-dev",
     "linux-lowlatency-cloud-tools-5.15.0-24",
     "linux-lowlatency-cloud-tools-common",
     "linux-lowlatency-headers-5.15.0-24",
     "linux-lowlatency-tools-5.15.0-24",
     "linux-lowlatency-tools-common",
     "linux-lowlatency-tools-host",
     "linux-modules-5.15.0-1002-gke",
     "linux-modules-5.15.0-1002-ibm",
     "linux-modules-5.15.0-1002-oracle",
     "linux-modules-5.15.0-1003-azure",
     "linux-modules-5.15.0-1003-gcp",
     "linux-modules-5.15.0-1004-aws",
     "linux-modules-5.15.0-1004-kvm",
     "linux-modules-5.15.0-1005-raspi",
     "linux-modules-5.15.0-1005-raspi-nolpae",
     "linux-modules-5.15.0-24-lowlatency",
     "linux-modules-5.15.0-24-lowlatency-64k",
     "linux-modules-5.15.0-25-generic",
     "linux-modules-5.15.0-25-generic-64k",
     "linux-modules-5.15.0-25-generic-lpae",
     "linux-modules-extra-5.15.0-1002-gke",
     "linux-modules-extra-5.15.0-1002-ibm",
     "linux-modules-extra-5.15.0-1002-oracle",
     "linux-modules-extra-5.15.0-1003-azure",
     "linux-modules-extra-5.15.0-1003-gcp",
     "linux-modules-extra-5.15.0-1004-aws",
     "linux-modules-extra-5.15.0-1004-kvm",
     "linux-modules-extra-5.15.0-1005-raspi",
     "linux-modules-extra-5.15.0-1005-raspi-nolpae",
     "linux-modules-extra-5.15.0-24-lowlatency",
     "linux-modules-extra-5.15.0-24-lowlatency-64k",
     "linux-modules-extra-5.15.0-25-generic",
     "linux-modules-extra-5.15.0-25-generic-64k",
     "linux-modules-extra-5.15.0-25-generic-lpae",
     "linux-nvidia",
     "linux-oracle-headers-5.15.0-1002",
     "linux-oracle-tools-5.15.0-1002",
     "linux-raspi-headers-5.15.0-1005",
     "linux-raspi-tools-5.15.0-1005",
     "linux-source-5.15.0",
     "linux-tools-5.15.0-1002-gke",
     "linux-tools-5.15.0-1002-ibm",
     "linux-tools-5.15.0-1002-oracle",
     "linux-tools-5.15.0-1003-azure",
     "linux-tools-5.15.0-1003-gcp",
     "linux-tools-5.15.0-1004-aws",
     "linux-tools-5.15.0-1004-kvm",
     "linux-tools-5.15.0-1005-raspi",
     "linux-tools-5.15.0-1005-raspi-nolpae",
     "linux-tools-5.15.0-24-lowlatency",
     "linux-tools-5.15.0-24-lowlatency-64k",
     "linux-tools-5.15.0-25",
     "linux-tools-5.15.0-25-generic",
     "linux-tools-5.15.0-25-generic-64k",
     "linux-tools-common",
     "linux-tools-host",
     "linux-udebs-aws",
     "linux-udebs-azure"
    ],
    "type": "dpkg_package"
   },
   "check_algorithm": "dpkg",
   "constraints": [
    {
     "requires": [
      {
       "scope": "target",
       "match": {
        "distro": "ubuntu"
       }
      },
      {
       "scope": "target",
       "match": {
        "os_version": "22.04"
       }
      }
     ]
    }
   ]
  },
  {
   "product": {
    "name": [
     "linux-aws-cloud-tools-6.11.0-1004",
     "linux-aws-headers-6.11.0-1004",
     "linux-aws-tools-6.11.0-1004",
     "linux-azure-cloud-tools-6.11.0-1004",
     "linux-azure-headers-6.11.0-1004",
     "linux-azure-tools-6.11.0-1004",
     "linux-bpf-dev",
     "linux-buildinfo-6.11.0-1003-gcp",
     "linux-buildinfo-6.11.0-1004-aws",
     "linux-buildinfo-6.11.0-1004-azure",
     "linux-buildinfo-6.11.0-1004-raspi",
     "linux-buildinfo-6.11.0-1006-oracle",
     "linux-buildinfo-6.11.0-1006-oracle-64k",
     "linux-buildinfo-6.11.0-8-generic",
     "linux-cloud-tools-6.11.0-1004-aws",
     "linux-cloud-tools-6.11.0-1004-azure",
     "linux-cloud-tools-6.11.0-1006-oracle",
     "linux-cloud-tools-6.11.0-1006-oracle-64k",
     "linux-cloud-tools-6.11.0-8",
     "linux-cloud-tools-6.11.0-8-generic",
     "linux-cloud-tools-common",
     "linux-doc",
     "linux-gcp-headers-6.11.0-1003",
     "linux-gcp-tools-6.11.0-1003",
     "linux-headers-6.11.0-1003-gcp",
     "linux-headers-6.11.0-1004-aws",
     "linux-headers-6.11.0-1004-azure",
     "linux-headers-6.11.0-1004-raspi",
     "linux-headers-6.11.0-1006-oracle",
     "linux-headers-6.11.0-1006-oracle-64k",
     "linux-headers-6.11.0-8",
     "linux-headers-6.11.0-8-generic",
     "linux-headers-6.11.0-8-generic-64k",
     "linux-image-6.11.0-1004-raspi",
     "linux-image-6.11.0-1004-raspi-dbgsym",
     "linux-image-6.11.0-8-generic",
     "linux-image-6.11.0-8-generic-dbgsym",
     "linux-image-unsigned-6.11.0-1003-gcp",
     "linux-image-unsigned-6.11.0-1003-gcp-dbgsym",
     "linux-image-unsigned-6.11.0-1004-aws",
     "linux-image-unsigned-6.11.0-1004-aws-dbgsym",
     "linux-image-unsigned-6.11.0-1004-azure",
     "linux-image-unsigned-6.11.0-1004-azure-dbgsym",
     "linux-image-unsigned-6.11.0-1006-oracle",
     "linux-image-unsigned-6.11.0-1006-oracle-64k",
     "linux-image-unsigned-6.11.0-1006-oracle-64k-dbgsym",
     "linux-image-unsigned-6.11.0-1006-oracle-dbgsym",
     "linux-image-unsigned-6.11.0-8-generic",
     "linux-image-unsigned-6.11.0-8-generic-64k",
     "linux-image-unsigned-6.11.0-8-generic-64k-dbgsym",
     "linux-image-unsigned-6.11.0-8-generic-dbgsym",
     "linux-lib-rust-6.11.0-8-generic",
     "linux-lib-rust-6.11.0-8-generic-64k",
     "linux-libc-dev",
     "linux-modules-6.11.0-1003-gcp",
     "linux-modules-6.11.0-1004-aws",
     "linux-modules-6.11.0-1004-azure",
     "linux-modules-6.11.0-1004-raspi",
     "linux-modules-6.11.0-1006-oracle",
     "linux-modules-6.11.0-1006-oracle-64k",
     "linux-modules-6.11.0-8-generic",
     "linux-modules-6.11.0-8-generic-64k",
     "linux-modules-extra-6.11.0-1003-gcp",
     "linux-modules-extra-6.11.0-1004-aws",
     "linux-modules-extra-6.11.0-1004-azure",
     "linux-modules-extra-6.11.0-1006-oracle",
     "linux-modules-extra-6.11.0-1006-oracle-64k",
     "linux-modules-extra-6.11.0-8-generic",
     "linux-modules-extra-6.11.0-8-generic-64k",
     "linux-modules-ipu6-6.11.0-8-generic",
     "linux-modules-ipu7-6.11.0-8-generic",
     "linux-modules-iwlwifi-6.11.0-1004-azure",
     "linux-modules-iwlwifi-6.11.0-1004-raspi",
     "linux-modules-iwlwifi-6.11.0-8-generic",
     "linux-modules-usbio-6.11.0-8-generic",
     "linux-modules-vision-6.11.0-8-generic",
     "linux-oracle-headers-6.11.0-1006",
     "linux-oracle-tools-6.11.0-1006",
     "linux-raspi-headers-6.11.0-1004",
     "linux-raspi-tools-6.11.0-1004",
     "linux-realtime",
     "linux-riscv-headers-6.11.0-8",
     "linux-riscv-tools-6.11.0-8",
     "linux-source-6.11.0",
     "linux-tools-6.11.0-1003-gcp",
     "linux-tools-6.11.0-1004-aws",
     "linux-tools-6.11.0-1004-azure",
     "linux-tools-6.11.0-1004-raspi",
     "linux-tools-6.11.0-1006-oracle",
     "linux-tools-6.11.0-1006-oracle-64k",
     "linux-tools-6.11.0-8",
     "linux-tools-6.11.0-8-generic",
     "linux-tools-common",
     "linux-tools-host",
     "linux-udebs-aws",
     "linux-udebs-azure"
    ],
    "type": "dpkg_package"
   },
   "check_algorithm": "dpkg",
   "constraints": [
    {
     "requires": [
      {
       "scope": "target",
       "match": {
        "distro": "ubuntu"
       }
      },
      {
       "scope": "target",
       "match": {
        "os_version": "24.10"
       }
      }
     ]
    }
   ]
  },
  {
   "product": {
    "name": [
     "linux-gcp-5.15",
     "linux-hwe-5.15",
     "linux-ibm-5.15",
     "linux-lowlatency-hwe-5.15",
     "linux-oracle-5.15",
     "linux-riscv-5.15"
    ],
    "type": "dpkg_package"
   },
   "check_algorithm": "dpkg",
   "constraints": [
    {
     "requires": [
      {
       "scope": "target",
       "match": {
        "distro": "ubuntu"
       }
      },
      {
       "scope": "target",
       "match": {
        "os_version": "20.04"
       }
      }
     ]
    }
   ]
  },
  {
   "product": {
    "name": [
     "linux-hwe-6.11",
     "linux-oem-6.11"
    ],
    "type": "dpkg_package"
   },
   "check_algorithm": "dpkg",
   "constraints": [
    {
     "requires": [
      {
       "scope": "target",
       "match": {
        "distro": "ubuntu"
       }
      },
      {
       "scope": "target",
       "match": {
        "os_version": "24.04"
       }
      }
     ]
    }
   ]
  }
 ]
};

var vdf_res = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result: vdf_res);