---
id: "CVE-2026-98664"
kind: "vulnerability"
aliases: ["CVE-2026-98664"]
title: "Linux kernel: IIO adis16400 debugfs read can use freed device memory"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["adis16400", "embedded", "iio", "linux-kernel", "runtime"]
not_affected_if: ["no-adis16400-hardware"]
published_at: "2026-10-18T16:17:19+00:00"
first_seen_at: "2026-10-23T21:57:16+00:00"
updated_at: "2026-10-25T05:19:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98664", "first_seen_at": "2026-10-23T21:57:16+00:00"}]
---

# Linux kernel: IIO adis16400 debugfs read can use freed device memory

In the Linux IIO driver for the ADIS16400 IMU, the serial_number debugfs file is not protected against unbind, so a read in progress can access memory freed when the device is unbound. The sources do not describe a specific attacker outcome beyond this use-after-free.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- Update the Linux kernel to a release that includes the upstream commit fixing iio: imu: adis16400 debugfs reads (the sources do not list version numbers).

## Timeline

- 2026-10-23T21:57:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98664

## From the sources

In the Linux kernel, the following vulnerability has been resolved:

iio: imu: adis16400: fix unprotected debugfs reads

adis16400_serial_number_fops is open coded and never calls
debugfs_file_get(), so debugfs_remove_recursive() does not wait for a
read in progress and unbind frees the iio_dev underneath it.

Commit ae1d37a9bb4b ("iio: imu: adis16400: use DEFINE_DEBUGFS_ATTRIBUTE
instead of DEFINE_SIMPLE_ATTRIBUTE") converted product_id and
flash_count to DEFINE_DEBUGFS_ATTRIBUTE, which protects itself, but
moved all three files to debugfs_create_file_unsafe().

serial_number prints three registers as "%.4x-%.4x-%.4x" and
DEFINE_DEBUGFS_ATTRIBUTE() formats a single u64, so it cannot be
converted without changing what the file returns. adis16475 and
adis16550 already use debugfs_create_file() for their open coded
files. Use it here too.

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