Linux Distros Unpatched Vulnerability : CVE-2023-53083

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

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  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/30");

  script_cve_id("CVE-2023-53083");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-53083");

  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: nfsd: don't replace page in rq_pages
    if it's a continuation of last page The splice read calls nfsd_splice_actor to put the pages containing
    file data into the svc_rqst->rq_pages array. It's possible however to get a splice result that only has a
    partial page at the end, if (e.g.) the filesystem hands back a short read that doesn't cover the whole
    page. nfsd_splice_actor will plop the partial page into its rq_pages array and return. Then later, when
    nfsd_splice_actor is called again, the remainder of the page may end up being filled out. At this point,
    nfsd_splice_actor will put the page into the array _again_ corrupting the reply. If this is done enough
    times, rq_next_page will overrun the array and corrupt the trailing fields -- the rq_respages and
    rq_next_page pointers themselves. If we've already added the page to the array in the last pass, don't add
    it to the array a second time when dealing with a splice continuation. This was originally handled
    properly in nfsd_splice_actor, but commit 91e23b1c3982 (NFSD: Clean up nfsd_splice_actor()) removed the
    check for it. (CVE-2023-53083)

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-2023-53083");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-53083");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  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:"cvss3_score_source", value:"CVE-2023-53083");

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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/15");

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  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", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
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  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")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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  },
  "Ubuntu Linux-18.04": {
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          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
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          {"reference": "linux-cloud-tools-4.15.0"},
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          {"reference": "kernel-rt-devel-matched"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-rt-modules-internal"},
          {"reference": "kernel-rt-modules-partner"},
          {"reference": "kernel-rt-selftests-internal"}
        ]
      }
    ]
  }
};

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