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Samsung Knox DualDAR CVE-2026-21101

| EUVDEUVD-2026-74642 HIGH
Improper Input Validation (CWE-20)
2026-09-09 SamsungMobile GHSA-jv9f-wr82-5qf2
8.4
CVSS 4.0 · Vendor: SamsungMobile
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Severity by source

Vendor (SamsungMobile) PRIMARY
8.4 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.7 MEDIUM

Local privileged access required (AV:L/PR:H); no scope change as subsequent systems are unaffected; full CIA impact once kernel execution is achieved.

3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 09, 2026 - 08:17 vuln.today
CVE Published
Sep 09, 2026 - 04:47 cve.org
HIGH 8.4

DescriptionCVE.org

Improper input validation in DualDAR driver prior to SMR Sep-2026 Release 1 allows local privileged attackers to potentially execute arbitrary code with root privilege.

AnalysisAI

Improper input validation in Samsung's DualDAR kernel driver enables a local privileged attacker to escalate privileges and execute arbitrary code at root level on affected Samsung Mobile Devices. DualDAR (Dual Data At Rest) is a Samsung Knox encryption subsystem implemented as a kernel-space driver across Android 14 through 17; a flaw in its input handling allows a caller with existing elevated privileges to corrupt driver state and reach kernel execution context. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires local access to the device with high privileges - specifically, the ability to interact with the DualDAR kernel driver interface, which is accessible only to privileged processes (e.g., system-level apps, root shell, or adb with elevated permissions). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) scores 8.4 and accurately characterizes this as a local, high-privilege-required vulnerability with full impact on the vulnerable system and no subsequent system scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is applying SMR Sep-2026 Release 1, the September 2026 Samsung Monthly Release for Android 14, 15, 16, and 17. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, audit your Samsung Mobile Device inventory to identify all devices running Android versions 14 through 17 and document which users have elevated privilege configurations. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-21101 vulnerability details – vuln.today

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