---
id: "CVE-2026-98943"
kind: "vulnerability"
aliases: ["CVE-2026-98943"]
title: "Linux kernel: Steam HID driver locking bugs, unlocked RCU access"
severity: "unknown"
cvss: null
epss: 0.00209
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "kernel", "linux", "steam-controller"]
not_affected_if: []
published_at: "2026-10-23T13:17:15+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98943", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-98943", "first_seen_at": "2026-10-25T12:38:50+00:00"}]
---

# Linux kernel: Steam HID driver locking bugs, unlocked RCU access

The Linux kernel's HID Steam controller driver had several locking problems, including RCU-protected accesses that were not guarded by a lock. The sources do not state what an attacker gets from this.

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

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98943
- 2026-10-25T12:38:50+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-98943

## From the sources

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

HID: steam: Clean up locking

This cleans up several issues with locking behavior, including RCU accesses
not being guarded behind a lock.

---

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