---
id: "CVE-2026-98679"
kind: "vulnerability"
aliases: ["CVE-2026-98679"]
title: "Linux kernel: duplicate IIO event disable underflows runtime PM count"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["embedded", "iio", "infrastructure", "linux-kernel"]
not_affected_if: ["no-kxcjk-1013-hardware"]
published_at: "2026-10-18T16:17:21+00:00"
first_seen_at: "2026-10-23T21:57:16+00:00"
updated_at: "2026-10-25T05:19:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98679", "first_seen_at": "2026-10-23T21:57:16+00:00"}]
---

# Linux kernel: duplicate IIO event disable underflows runtime PM count

In the Linux kernel's kxcjk-1013 accelerometer driver, repeatedly disabling an event drops a runtime PM reference that was never taken. This underflows the usage counter and logs a warning.

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

## How to check

- unknown

## Fix

- Update to a Linux kernel release that includes the upstream commit resolving this issue, per the kernel stable tree or your distribution's advisory.

## Timeline

- 2026-10-23T21:57:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98679

## From the sources

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

iio: accel: kxcjk-1013: reject duplicate event disable

The IIO core does not filter duplicate writes to the event enable
attribute. kxcjk1013_write_event_config() already ignores repeated
enable requests, but a repeated disable request still calls
kxcjk1013_set_power_state(data, false), dropping a runtime PM reference
that was not acquired for this request. This can underflow the runtime
PM usage count and trigger a "Runtime PM usage count underflow" warning.

Return early when the requested state already matches ev_enable_state.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_