---
title: "CVE-2026-19574: Linux ARM64 - Broken Access Control"
description: "The ARM64 Linux kernel contains a broken access control vulnerability in arch_mem_domain_init() due to ASID reuse after wraparound, letting user-mode threads bypass memory domain isolation and access other domains' memory, exploit requires creating more than 255 memory domains."
url: https://panop.io/threat-heartbeat/CVE-2026-19574/
---

# CVE-2026-19574 Linux ARM64 - Broken Access Control

The ARM64 Linux kernel contains a broken access control vulnerability in arch\_mem\_domain\_init() due to ASID reuse after wraparound, letting user-mode threads bypass memory domain isolation and access other domains' memory, exploit requires creating more than 255 memory domains.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19574)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

9 October 2026

Updated

15 October 2026

Weakness

[CWE-284](https://cwe.mitre.org/data/definitions/284.html)

## Vendor fix

Update to a kernel version that includes the fix scanning live domains and preventing ASID reuse, or latest available version

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-19574](https://nvd.nist.gov/vuln/detail/CVE-2026-19574)
- [https://github.com/zephyrproject-rtos/zephyr/commit/805054b8ed89dd5441fbca36b3cd3be7e4fb4100](https://github.com/zephyrproject-rtos/zephyr/commit/805054b8ed89dd5441fbca36b3cd3be7e4fb4100)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-923h-8c2j-pcm5](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-923h-8c2j-pcm5)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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