Samsung Knox DualDAR CVE-2026-21101

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). A network-remote attacker cannot directly reach this driver. Exploitation is therefore constrained to scenarios where: (1) the attacker has physical access to an unlocked device with adb enabled, (2) a privileged app on the device has already been compromised via a separate vulnerability, or (3) the device is enrolled in a context that grants elevated shell access. The low attack complexity (AC:L) means no race conditions or special timing is needed once the privileged access prerequisite is met. Devices running Android 18+ or already patched to SMR Sep-2026 Release 1 are not affected.

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. The PR:H requirement materially limits real-world risk: exploitation requires the attacker to already hold elevated local privileges (e.g., a compromised privileged system app, adb with elevated shell, or an already-chained first-stage exploit). This is therefore most relevant as a second-stage component in a multi-step attack chain rather than a standalone entry point. EPSS data is not available in the provided intelligence. There is no KEV listing and no public exploit code, meaning active exploitation is not confirmed. The broad Android version coverage (14-17) means a large proportion of Samsung's active device fleet is in scope, but the practical risk is constrained by the local/privileged access prerequisite.

An attacker who has already compromised a privileged Android application or obtained an elevated adb shell on a vulnerable Samsung device crafts a malformed input payload targeting the DualDAR kernel driver interface. The driver fails to properly validate the input, corrupting kernel state and enabling the attacker to redirect execution to attacker-controlled code running as root. No public proof-of-concept is known, but the low attack complexity (AC:L) suggests exploitation is technically straightforward once local privileged access is established.