Which versions of Samsung Mobile Devices are affected by EUVD-2026-55093?

A buffer overflow in Samsung Mobile Devices' Radio Interface Layer allows attackers with established high-level local access-including malicious insiders-to execute arbitrary code with full device…

How to fix or mitigate EUVD-2026-55093?

Within 24 hours, inventory all Samsung Mobile Devices deployed in your organization and identify which are running firmware prior to Samsung Mobile Security Release Aug-2026 Release 1. Within 7 days, implement strict controls on local privileged access via mobile device management, restrict administrative credentials to critical personnel only, and enable comprehensive logging of high-privilege operations. Within 30 days, prioritize deployment of Samsung Mobile Security Release Aug-2026 Release 1 across the affected device population and confirm patch application through device inventory systems.

Samsung Mobile Devices EUVD-2026-55093

Q: What is the CVSS score of EUVD-2026-55093?

EUVD-2026-55093 has a CVSS 4.0 base score of 8.4 (High). CVSS 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/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. EPSS exploitation probability: 0.1%.

| CVE-2026-21068 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-08-10 SamsungMobile

GHSA-9qx8-f834-w4gq

RCE Buffer Overflow Stack Overflow Samsung Mobile Devices Samsung Mobile

8.4

CVSS 4.0 · Vendor: SamsungMobile

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 vector and high privileges required per description; unchanged scope as no cross-system impact indicated; full CIA impact from arbitrary code execution.

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

Lifecycle Timeline

Analysis Generated

Aug 10, 2026 - 09:02 vuln.today

CVE Published

Aug 10, 2026 - 07:41 cve.org

HIGH 8.4

DescriptionCVE.org

Stack-based buffer overflow in libril_sem.so prior to SMR Aug-2026 Release 1 allows privileged local attackers to execute arbitrary code.

AnalysisAI

Stack-based buffer overflow in libril_sem.so - Samsung's Radio Interface Layer shared library - enables privileged local attackers to execute arbitrary code on affected Samsung Mobile Devices prior to SMR Aug-2026 Release 1. The CVSS 4.0 vector (AV:L/PR:H) confirms exploitation requires established local access with high privileges, limiting the realistic attacker pool to already-compromised or insider-threat scenarios. No public exploit code or CISA KEV listing has been identified at time of analysis.

Technical ContextAI

libril_sem.so is a proprietary Samsung shared library implementing the Radio Interface Layer (RIL) - the software abstraction between Android's telephony stack and the baseband modem hardware. A stack-based buffer overflow (writing beyond the bounds of a stack-allocated buffer) in this library allows an attacker with high privileges to corrupt the call stack and redirect execution to attacker-controlled code. The CPE string cpe:2.3:a:samsung_mobile:samsung_mobile_devices:*:*:*:*:*:*:*:* indicates the vulnerability is in Samsung's application-layer software rather than the baseband firmware itself. No CWE identifier was assigned in the NVD record, though the description clearly maps to CWE-121 (Stack-based Buffer Overflow).

RemediationAI

Apply SMR Aug-2026 Release 1 or later, which is confirmed by Samsung as the fix release for this vulnerability. Users should navigate to Settings > Software Update on their Samsung device and install the August 2026 security patch. The vendor advisory is available at https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=08. For enterprise deployments using Samsung Knox or MDM solutions, administrators should enforce the minimum patch level corresponding to SMR Aug-2026 Release 1. No workarounds or compensating controls are identified in the available data; given the local high-privilege requirement, restricting physical and privileged logical access to devices is the most actionable interim measure while patches are deployed.