---
id: CVE-2026-21087
title: >-
  Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows
  local attackers to execute arbitrary code with system server privilege.
summary: >-
  Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows
  local attackers to execute arbitrary code with system server privilege.
severity: high
cvss: 8.6
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-787
vendor: Samsung Mobile
product: Samsung Mobile Devices
affected:
  - devices (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T00:00:00+00:00'
published: '2026-09-09'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T03:56:40.360Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-21087'
references:
  - url: 'https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09'
tags:
  - cve.org
epss: 0.00115
epssPercentile: 0.0173
ingestedAt: '2026-09-11T16:45:47.925Z'
---

## Overview

Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege.

## Affected

- `devices (all versions)`

## Remediation

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