Linux Distros Unpatched Vulnerability : CVE-2025-38016

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

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  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2025-38016");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-38016");

  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: HID: bpf: abort dispatch if device
    destroyed The current HID bpf implementation assumes no output report/request will go through it after
    hid_bpf_destroy_device() has been called. This leads to a bug that unplugging certain types of HID devices
    causes a cleaned- up SRCU to be accessed. The bug was previously a hidden failure until a recent x86
    percpu change [1] made it access not-present pages. The bug will be triggered if the conditions below are
    met: A) a device under the driver has some LEDs on B) hid_ll_driver->request() is uninplemented (e.g.,
    logitech-djreceiver) If condition A is met, hidinput_led_worker() is always scheduled *after*
    hid_bpf_destroy_device(). hid_destroy_device ` hid_bpf_destroy_device `
    cleanup_srcu_struct(&hdev->bpf.srcu) ` hid_remove_device ` ... ` led_classdev_unregister `
    led_trigger_set(led_cdev, NULL) ` led_set_brightness(led_cdev, LED_OFF) ` ... ` input_inject_event `
    input_event_dispose ` hidinput_input_event ` schedule_work(&hid->led_work) [hidinput_led_worker] This is
    fine when condition B is not met, where hidinput_led_worker() calls hid_ll_driver->request(). This is the
    case for most HID drivers, which implement it or use the generic one from usbhid. The driver itself or an
    underlying driver will then abort processing the request. Otherwise, hidinput_led_worker() tries
    hid_hw_output_report() and leads to the bug. hidinput_led_worker ` hid_hw_output_report `
    dispatch_hid_bpf_output_report ` srcu_read_lock(&hdev->bpf.srcu) ` srcu_read_unlock(&hdev->bpf.srcu, idx)
    The bug has existed since the introduction [2] of dispatch_hid_bpf_output_report(). However, the same bug
    also exists in dispatch_hid_bpf_raw_requests(), and I've reproduced (no visible effect because of the lack
    of [1], but confirmed bpf.destroyed == 1) the bug against the commit (i.e., the Fixes:) introducing the
    function. This is because hidinput_led_worker() falls back to hid_hw_raw_request() when
    hid_ll_driver->output_report() is uninplemented (e.g., logitech- djreceiver). hidinput_led_worker `
    hid_hw_output_report: -ENOSYS ` hid_hw_raw_request ` dispatch_hid_bpf_raw_requests `
    srcu_read_lock(&hdev->bpf.srcu) ` srcu_read_unlock(&hdev->bpf.srcu, idx) Fix the issue by returning early
    in the two mentioned functions if hid_bpf has been marked as destroyed. Though
    dispatch_hid_bpf_device_event() handles input events, and there is no evidence that it may be called after
    the destruction, the same check, as a safety net, is also added to it to maintain the consistency among
    all dispatch functions. The impact of the bug on other architectures is unclear. Even if it acts as a
    hidden failure, this is still dangerous because it corrupts whatever is on the address calculated by SRCU.
    Thus, CC'ing the stable list. [1]: commit 9d7de2aa8b41 (x86/percpu/64: Use relative percpu offsets) [2]:
    commit 9286675a2aed (HID: bpf: add HID-BPF hooks for hid_hw_output_report) (CVE-2025-38016)

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-2025-38016");
  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: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-2025-38016");

  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:"2025/06/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/07");

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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');

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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "16.04",
        "pkgs": [
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          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-oem-6.11"},
          {"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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"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');
}