Linux Distros Unpatched Vulnerability : CVE-2026-92707

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

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if (description)
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  script_id(367354);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/21");

  script_cve_id("CVE-2026-92707");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-92707");

  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.

  - MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-
    controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory
    allocation. The formatter allocates an object[] from each declared array length before the configured
    object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread
    bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large
    arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe
    managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure
    requires an application to deserialize untrusted data through the affected formatter path and permit
    repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an
    object parameter and AddMessagePackProtocol() enabled. This issue is fixed in versions 2.5.303 and 3.1.9.
    (CVE-2026-92707)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-92707");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L");
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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/19");

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  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");
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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 = {
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "dotnet6"},
          {"reference": "dotnet7"},
          {"reference": "dotnet8"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host-8.0"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-dbg-8.0"},
          {"reference": "dotnet-targeting-pack-8.0"},
          {"reference": "dotnet-templates-8.0"},
          {"reference": "dotnet10"},
          {"reference": "dotnet8"},
          {"reference": "netstandard-targeting-pack-2.1-8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "aspnetcore-runtime-10.0"},
          {"reference": "aspnetcore-runtime-dbg-10.0"},
          {"reference": "aspnetcore-targeting-pack-10.0"},
          {"reference": "dotnet-apphost-pack-10.0"},
          {"reference": "dotnet-host-10.0"},
          {"reference": "dotnet-hostfxr-10.0"},
          {"reference": "dotnet-runtime-10.0"},
          {"reference": "dotnet-runtime-dbg-10.0"},
          {"reference": "dotnet-sdk-10.0"},
          {"reference": "dotnet-sdk-10.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-aot-10.0"},
          {"reference": "dotnet-sdk-dbg-10.0"},
          {"reference": "dotnet-targeting-pack-10.0"},
          {"reference": "dotnet-templates-10.0"},
          {"reference": "dotnet10"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
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          {"reference": "dotnet8.0"},
          {"reference": "netstandard-targeting-pack-2.1"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-dbg-8.0"},
          {"reference": "dotnet-targeting-pack-8.0"},
          {"reference": "dotnet-templates-8.0"},
          {"reference": "dotnet8.0"},
          {"reference": "netstandard-targeting-pack-2.1"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "aspnetcore-runtime-10.0"},
          {"reference": "aspnetcore-runtime-dbg-10.0"},
          {"reference": "aspnetcore-targeting-pack-10.0"},
          {"reference": "dotnet-apphost-pack-10.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-10.0"},
          {"reference": "dotnet-runtime-10.0"},
          {"reference": "dotnet-runtime-dbg-10.0"},
          {"reference": "dotnet-sdk-10.0"},
          {"reference": "dotnet-sdk-10.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-aot-10.0"},
          {"reference": "dotnet-sdk-dbg-10.0"},
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          {"reference": "dotnet-templates-10.0"},
          {"reference": "dotnet10.0"}
        ]
      }
    ]
  }
};

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');
}