Privileged memory corruption via out-of-bounds Keymaster writes
Published Sep 9, 2026 · Updated Sep 11, 2026
Out-of-bounds write in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local privileged attackers to corrupt memory. The Keymaster trustlet writes beyond its intended memory bounds, but Samsung has not disclosed the affected operation, input, or buffer. Exploitation requires local high privileges on a device running Android 14, 15, 16, or 17, and the published impact is limited to memory corruption within the vulnerable trustlet.
Summary
What happened
Out-of-bounds write in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local privileged attackers to corrupt memory. The Keymaster trustlet writes beyond its intended memory bounds, but Samsung has not disclosed the affected operation, input, or buffer. Exploitation requires local high privileges on a device running Android 14, 15, 16, or 17, and the published impact is limited to memory corruption within the vulnerable trustlet.
The record
- CVE
- CVE-2026-21085
- Published
- Sep 9, 2026
- Updated
- Sep 11, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- admin
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
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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
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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