Linux Distros Unpatched Vulnerability : CVE-2025-39986

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

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  script_id(271541);
  script_version("1.25");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2025-39986");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-39986");

  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.

  - can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow Sending an PF_PACKET allows to bypass
    the CAN framework logic and to directly reach the xmit() function of a CAN driver. The only check which is
    performed by the PF_PACKET framework is to make sure that skb->len fits the interface's MTU.
    Unfortunately, because the sun4i_can driver does not populate its net_device_ops->ndo_change_mtu(), it is
    possible for an attacker to configure an invalid MTU by doing, for example: $ ip link set can0 mtu 9999
    After doing so, the attacker could open a PF_PACKET socket using the ETH_P_CANXL protocol:
    socket(PF_PACKET, SOCK_RAW, htons(ETH_P_CANXL)) to inject a malicious CAN XL frames. For example: struct
    canxl_frame frame = { .flags = 0xff, .len = 2048, }; The CAN drivers' xmit() function are calling
    can_dev_dropped_skb() to check that the skb is valid, unfortunately under above conditions, the malicious
    packet is able to go through can_dev_dropped_skb() checks: 1. the skb->protocol is set to ETH_P_CANXL
    which is valid (the function does not check the actual device capabilities). 2. the length is a valid CAN
    XL length. And so, sun4ican_start_xmit() receives a CAN XL frame which it is not able to correctly handle
    and will thus misinterpret it as a CAN frame. This can result in a buffer overflow. The driver will
    consume cf->len as-is with no further checks on this line: dlc = cf->len; Here, cf->len corresponds to the
    flags field of the CAN XL frame. In our previous example, we set canxl_frame->flags to 0xff. Because the
    maximum expected length is 8, a buffer overflow of 247 bytes occurs a couple line below when doing: for (i
    = 0; i < dlc; i++) writel(cf->data[i], priv->base + (dreg + i * 4)); Populate
    net_device_ops->ndo_change_mtu() to ensure that the interface's MTU can not be set to anything bigger than
    CAN_MTU. By fixing the root cause, this prevents the buffer overflow. (CVE-2025-39986)

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-2025-39986");
  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:P/A:C");
  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:H/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-2025-39986");

  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:"2025/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/27");

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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": "14.04",
        "pkgs": [
          {"reference": "linux-aws"},
          {"reference": "linux-azure"},
          {"reference": "linux-lts-xenial"}
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      }
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  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
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          {"reference": "linux-aws-hwe"},
          {"reference": "linux-azure"},
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          {"reference": "linux-gcp"},
          {"reference": "linux-headers-4.4.0"},
          {"reference": "linux-hwe"},
          {"reference": "linux-hwe-edge"},
          {"reference": "linux-image-4.4.0"},
          {"reference": "linux-image-extra-4.4.0"},
          {"reference": "linux-kvm"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-oracle"},
          {"reference": "linux-source-4.4.0"},
          {"reference": "linux-tools-4.4.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-generic-lpae"},
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          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
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          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-headers-5.4.0"},
          {"reference": "linux-azure-tools-5.4.0"},
          {"reference": "linux-bluefield"},
          {"reference": "linux-buildinfo-5.4.0"},
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          {"reference": "linux-cloud-tools-5.6.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-5.11"},
          {"reference": "linux-gcp-5.13"},
          {"reference": "linux-gcp-5.8"},
          {"reference": "linux-gcp-headers-5.4.0"},
          {"reference": "linux-gcp-tools-5.4.0"},
          {"reference": "linux-gke"},
          {"reference": "linux-gke-5.15"},
          {"reference": "linux-gkeop"},
          {"reference": "linux-gkeop-5.15"},
          {"reference": "linux-headers-5.4.0"},
          {"reference": "linux-headers-5.6.0"},
          {"reference": "linux-hwe-5.11"},
          {"reference": "linux-hwe-5.13"},
          {"reference": "linux-hwe-5.8"},
          {"reference": "linux-ibm"},
          {"reference": "linux-image-5.4.0"},
          {"reference": "linux-image-unsigned-5.4.0"},
          {"reference": "linux-image-unsigned-5.6.0"},
          {"reference": "linux-intel-5.13"},
          {"reference": "linux-iot"},
          {"reference": "linux-kvm-cloud-tools-5.4.0"},
          {"reference": "linux-kvm-headers-5.4.0"},
          {"reference": "linux-kvm-tools-5.4.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-5.4.0"},
          {"reference": "linux-modules-5.6.0"},
          {"reference": "linux-modules-extra-5.4.0"},
          {"reference": "linux-modules-extra-5.6.0"},
          {"reference": "linux-oem-5.10"},
          {"reference": "linux-oem-5.13"},
          {"reference": "linux-oem-5.14"},
          {"reference": "linux-oem-5.6-headers-5.6.0"},
          {"reference": "linux-oem-5.6-tools-5.6.0"},
          {"reference": "linux-oem-5.6-tools-common"},
          {"reference": "linux-oem-5.6-tools-host"},
          {"reference": "linux-oracle-5.11"},
          {"reference": "linux-oracle-5.13"},
          {"reference": "linux-oracle-5.8"},
          {"reference": "linux-oracle-headers-5.4.0"},
          {"reference": "linux-oracle-tools-5.4.0"},
          {"reference": "linux-raspi-headers-5.4.0"},
          {"reference": "linux-raspi-tools-5.4.0"},
          {"reference": "linux-raspi2"},
          {"reference": "linux-riscv-5.11"},
          {"reference": "linux-riscv-5.8"},
          {"reference": "linux-riscv-headers-5.4.0"},
          {"reference": "linux-riscv-tools-5.4.0"},
          {"reference": "linux-source-5.4.0"},
          {"reference": "linux-tools-5.4.0"},
          {"reference": "linux-tools-5.6.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-generic-lpae"},
          {"reference": "linux-udebs-kvm"},
          {"reference": "linux-udebs-oem"},
          {"reference": "linux-xilinx-zynqmp"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "linux-allwinner-5.19"},
          {"reference": "linux-aws-5.19"},
          {"reference": "linux-aws-6.2"},
          {"reference": "linux-aws-6.5"},
          {"reference": "linux-azure-5.19"},
          {"reference": "linux-azure-6.2"},
          {"reference": "linux-azure-6.5"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-fde-5.19"},
          {"reference": "linux-azure-fde-6.2"},
          {"reference": "linux-azure-fde-6.8"},
          {"reference": "linux-buildinfo-5.15.0"},
          {"reference": "linux-buildinfo-5.17.0"},
          {"reference": "linux-cloud-tools-5.15.0"},
          {"reference": "linux-cloud-tools-5.17.0"},
          {"reference": "linux-gcp-5.19"},
          {"reference": "linux-gcp-6.2"},
          {"reference": "linux-gcp-6.5"},
          {"reference": "linux-headers-5.15.0"},
          {"reference": "linux-headers-5.17.0"},
          {"reference": "linux-hwe-5.19"},
          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
          {"reference": "linux-image-5.15.0"},
          {"reference": "linux-image-unsigned-5.17.0"},
          {"reference": "linux-intel-iot-realtime"},
          {"reference": "linux-lowlatency-hwe-5.19"},
          {"reference": "linux-lowlatency-hwe-6.2"},
          {"reference": "linux-lowlatency-hwe-6.5"},
          {"reference": "linux-modules-5.15.0"},
          {"reference": "linux-modules-5.17.0"},
          {"reference": "linux-modules-extra-5.15.0"},
          {"reference": "linux-modules-extra-5.17.0"},
          {"reference": "linux-nvidia-6.2"},
          {"reference": "linux-nvidia-6.5"},
          {"reference": "linux-oem-5.17-headers-5.17.0"},
          {"reference": "linux-oem-5.17-tools-5.17.0"},
          {"reference": "linux-oem-5.17-tools-host"},
          {"reference": "linux-oem-6.0"},
          {"reference": "linux-oem-6.1"},
          {"reference": "linux-oem-6.5"},
          {"reference": "linux-oracle-6.5"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-aws-6.14"},
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.14"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-fde-6.14"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-azure-nvidia"},
          {"reference": "linux-azure-nvidia-6.14"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-gcp-6.14"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-nvidia-6.11"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-oracle-6.14"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-6.14.0"},
          {"reference": "linux-aws-headers-6.14.0"},
          {"reference": "linux-aws-tools-6.14.0"},
          {"reference": "linux-azure-cloud-tools-6.14.0"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-headers-6.14.0"},
          {"reference": "linux-azure-tools-6.14.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-6.14.0"},
          {"reference": "linux-cloud-tools-6.14.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-6.14.0"},
          {"reference": "linux-gcp-tools-6.14.0"},
          {"reference": "linux-headers-6.14.0"},
          {"reference": "linux-image-6.14.0"},
          {"reference": "linux-image-unsigned-6.14.0"},
          {"reference": "linux-lib-rust-6.14.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-6.14.0"},
          {"reference": "linux-modules-extra-6.14.0"},
          {"reference": "linux-modules-ipu6-6.14.0"},
          {"reference": "linux-modules-ipu7-6.14.0"},
          {"reference": "linux-modules-iwlwifi-6.14.0"},
          {"reference": "linux-modules-usbio-6.14.0"},
          {"reference": "linux-modules-vision-6.14.0"},
          {"reference": "linux-oracle-headers-6.14.0"},
          {"reference": "linux-oracle-tools-6.14.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-6.14.0"},
          {"reference": "linux-raspi-tools-6.14.0"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.14.0"},
          {"reference": "linux-riscv-tools-6.14.0"},
          {"reference": "linux-source-6.14.0"},
          {"reference": "linux-tools-6.14.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-xilinx"}
        ]
      }
    ]
  }
};

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');
}