---
id: CVE-2026-20542
title: 'In apusys, there is a possible memory corruption due to use after free'
summary: >-
  In apusys, there is a possible memory corruption due to use after free. This
  could lead to local escalation of privilege if a malicious actor has already
  obtained the System privilege. User interaction is not needed for
  exploitation. Pat…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: mediatek
product: mt2718_firmware
affected:
  - mt2718_firmware
  - mt6878_firmware
  - mt6897_firmware
  - mt6899_firmware
  - mt6989_firmware
  - mt6991_firmware
  - mt8171_firmware
  - mt8188_firmware
  - mt8189_firmware
  - mt8196_firmware
  - mt8370_firmware
  - mt8371_firmware
  - mt8390_firmware
  - mt8391_firmware
  - mt8395_firmware
  - mt8678_firmware
  - mt8792_firmware
  - mt8793_firmware
  - mt8796_firmware
published: '2026-10-05'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T17:37:29.853'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20542'
references:
  - url: 'https://www.mediatek.com/product-security-bulletin/October-2026'
    label: security@mediatek.com
tags:
  - nvd
  - cve.org
epss: 0.00114
epssPercentile: 0.01479
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-05T10:23:51.780035Z'
ingestedAt: '2026-10-05T02:10:36.189Z'
---

## Overview

In apusys, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11076799; Issue ID: MSV-8143.

## Affected

- `mt2718_firmware`
- `mt6878_firmware`
- `mt6897_firmware`
- `mt6899_firmware`
- `mt6989_firmware`
- `mt6991_firmware`
- `mt8171_firmware`
- `mt8188_firmware`
- `mt8189_firmware`
- `mt8196_firmware`
- `mt8370_firmware`
- `mt8371_firmware`
- `mt8390_firmware`
- `mt8391_firmware`
- `mt8395_firmware`
- `mt8678_firmware`
- `mt8792_firmware`
- `mt8793_firmware`
- `mt8796_firmware`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.