CVE-2026-21104

Privileged code execution via trustlet heap overflow

Published Sep 9, 2026 · Updated Sep 10, 2026

Heap-based buffer overflow in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code. The KnoxVault trustlet fails to validate an unspecified input before processing it, causing the heap-based overwrite. Exploitation requires privileged local access and can execute code within the affected trustlet; Samsung has not disclosed the input or function involved.

CVSS severity7.1
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Samsung Mobile Devices before SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code. The KnoxVault trustlet fails to validate an unspecified input before processing it, causing the heap-based overwrite. Exploitation requires privileged local access and can execute code within the affected trustlet; Samsung has not disclosed the input or function involved.

The record

CVE
CVE-2026-21104
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-122
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

Attack vectorlocal
Required privilegesadmin

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile DevicesAffected versions are unavailable in this record.

Published CVSS scores

7.1Samsung MobileCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

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

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Your stack

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