System-server code execution via libmdnie.so bounds violation
Published Sep 9, 2026 · Updated Sep 11, 2026
Out-of-bounds write in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local users to execute code with system server privilege. libmdnie.so fails to validate input properly before a memory write, permitting data to be written beyond the destination buffer. Local access is required; successful exploitation executes attacker-controlled code in the privileged system-server context.
Summary
What happened
Out-of-bounds write in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local users to execute code with system server privilege. libmdnie.so fails to validate input properly before a memory write, permitting data to be written beyond the destination buffer. Local access is required; successful exploitation executes attacker-controlled code in the privileged system-server context.
The record
- CVE
- CVE-2026-21087
- Published
- Sep 9, 2026
- Updated
- Sep 11, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo