Out-of-bounds write in Keymaster trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to write out-of-bounds memory.

Attack Vector Local

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00106.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Samsung Mobile Samsung Mobile Devices affected
Version Status Constraints
SMR Sep-2026 Release in Android 14, 15, 16, 17 unaffected < *

No data.

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09 cve-icon cve-icon
History

Wed, 09 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
Title Out‑of‑Bounds Write in Samsung Keymaster Trustlet Enables Local Privilege Escalation
Weaknesses CWE-787

Wed, 09 Sep 2026 05:00:00 +0000

Type Values Removed Values Added
Description Out-of-bounds write in Keymaster trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to write out-of-bounds memory.
References
Metrics cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: SamsungMobile

Published:

Updated: 2026-09-09T04:47:32.562Z

Reserved: 2025-12-11T01:33:35.826Z

Link: CVE-2026-21085

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-09T05:17:20.473

Modified: 2026-09-09T15:45:14.503

Link: CVE-2026-21085

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T11:30:09Z

Weaknesses