Privileged code execution via unchecked codec lengths
Published May 13, 2026 · Updated May 13, 2026
Out-of-bounds write in SveService on Samsung Mobile Devices before SMR May-2026 Release 1 allows local users to execute arbitrary code. The sveJNISVE_SetCodecInfo native routine uses attacker-controlled codec lengths in stack allocation, memset, and memcpy without bounds checks. Samsung rates exploitation as local and high-privilege; the public proof of concept demonstrates a service crash, not code execution.
Summary
What happened
Out-of-bounds write in SveService on Samsung Mobile Devices before SMR May-2026 Release 1 allows local users to execute arbitrary code. The sveJNISVE_SetCodecInfo native routine uses attacker-controlled codec lengths in stack allocation, memset, and memcpy without bounds checks. Samsung rates exploitation as local and high-privilege; the public proof of concept demonstrates a service crash, not code execution.
The record
- CVE
- CVE-2026-21018
- Published
- May 13, 2026
- Updated
- May 13, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- May 13, 2026CVE publishedPublication date reported by the CVE source.
- May 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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.
Weakness, pattern, technique
Public exploit references
- SveService Buffer Overflow proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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