---
id: "CVE-2026-84634"
kind: "vulnerability"
aliases: ["CVE-2026-84634"]
title: "Apple iOS, macOS and visionOS: race condition lets an app crash system or write kernel memory"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple-devices", "infrastructure", "ios", "ipados", "macos", "visionos"]
not_affected_if: []
published_at: "2026-10-26T21:20:20+00:00"
first_seen_at: "2026-10-26T21:55:21+00:00"
updated_at: "2026-10-26T21:57:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84634", "first_seen_at": "2026-10-26T21:55:21+00:00"}]
---

# Apple iOS, macOS and visionOS: race condition lets an app crash system or write kernel memory

A race condition in Apple's operating systems, fixed with additional validation in iOS 27, iPadOS 27, macOS Golden Gate 27 and visionOS 27, lets a malicious app cause unexpected system termination. The same flaw can also let an app write kernel memory, which is a serious privilege escalation risk.

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

## How to check

- unknown

## Fix

- Update to iOS 27, iPadOS 27, macOS Golden Gate 27 or visionOS 27 or later, as published by Apple.

## Timeline

- 2026-10-26T21:55:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-84634

## From the sources

A race condition was addressed with additional validation. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, visionOS 27. An app may be able to cause unexpected system termination or write kernel memory.

---

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