Linux Distros Unpatched Vulnerability : CVE-2025-37799

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

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  script_id(247712);
  script_version("1.25");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2025-37799");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-37799");

  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: vmxnet3: Fix malformed packet sizing
    in vmxnet3_process_xdp vmxnet3 driver's XDP handling is buggy for packet sizes using ring0 (that is,
    packet sizes between 128 - 3k bytes). We noticed MTU-related connectivity issues with Cilium's service
    load- balancing in case of vmxnet3 as NIC underneath. A simple curl to a HTTP backend service where the
    XDP LB was doing IPIP encap led to overly large packet sizes but only for *some* of the packets (e.g. HTTP
    GET request) while others (e.g. the prior TCP 3WHS) looked completely fine on the wire. In fact, the pcap
    recording on the backend node actually revealed that the node with the XDP LB was leaking uninitialized
    kernel data onto the wire for the affected packets, for example, while the packets should have been 152
    bytes their actual size was 1482 bytes, so the remainder after 152 bytes was padded with whatever other
    data was in that page at the time (e.g. we saw user/payload data from prior processed packets). We only
    noticed this through an MTU issue, e.g. when the XDP LB node and the backend node both had the same MTU
    (e.g. 1500) then the curl request got dropped on the backend node's NIC given the packet was too large
    even though the IPIP-encapped packet normally would never even come close to the MTU limit. Lowering the
    MTU on the XDP LB (e.g. 1480) allowed to let the curl request succeed (which also indicates that the
    kernel ignored the padding, and thus the issue wasn't very user-visible). Commit e127ce7699c1 (vmxnet3:
    Fix missing reserved tailroom) was too eager to also switch xdp_prepare_buff() from rcd->len to rbi->len.
    It really needs to stick to rcd->len which is the actual packet length from the descriptor. The latter we
    also feed into vmxnet3_process_xdp_small(), by the way, and it indicates the correct length needed to
    initialize the xdp->{data,data_end} parts. For e127ce7699c1 (vmxnet3: Fix missing reserved tailroom) the
    relevant part was adapting xdp_init_buff() to address the warning given the xdp_data_hard_end() depends on
    xdp->frame_sz. With that fixed, traffic on the wire looks good again. (CVE-2025-37799)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-37799");
  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:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/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:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-37799");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/10");

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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2025-2026 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/Debian/dpkg-l"))) 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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        "release": "18.04",
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          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "linux-azure-fde"}
        ]
      }
    ]
  }
};

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');
}