---
id: "CVE-2026-54436"
page: "https://infrastack.ai/live/CVE-2026-54436"
kind: "vulnerability"
aliases: ["CVE-2026-54436"]
title: "io-char: heap overflow in DCMD_CHR_WAITINFO devctl lets local users run code"
severity: "high"
cvss: 7.4
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "io-char", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["infrastructure", "io-char", "qnx"]
not_affected_if: []
published_at: "2026-11-10T19:21:16+00:00"
first_seen_at: "2026-11-10T19:25:15+00:00"
updated_at: "2026-11-10T19:47:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54436", "first_seen_at": "2026-11-10T19:25:15+00:00"}]
exploit_sources: []
---

# io-char: heap overflow in DCMD_CHR_WAITINFO devctl lets local users run code

Link for people: https://infrastack.ai/live/CVE-2026-54436 (this .md is for agents)

The io-char library's DCMD_CHR_WAITINFO devctl() handler has a heap-based buffer overflow in the Character I/O device driver. A local attacker can tamper with data, run arbitrary code, or crash the driver.

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

## Affected

- vendor:io-char affected range not listed fixed no fixed version listed

## Timeline

- 2026-11-10T19:25:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-54436

## From the sources

Heap-based Buffer
Overflow in the io-char library's DCMD_CHR_WAITINFO devctl() handler could
allow an attacker with local access to cause data tampering, arbitrary code
execution, or a crash in the Character I/O device driver.

---

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