CVE-2026-21110 in One UI
Summary
by MITRE • 09/09/2026
Out-of-bounds write in libsavscmn.so prior to One UI 8.5 allows local attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds write within the libsavscmn.so library represents a critical memory corruption flaw that existed in Samsung devices running software versions prior to One UI 8.5. This specific dynamic link library is integral to system-level functions, often handling sensitive data management or communication between core operating system components and hardware interfaces. The nature of an out-of-bounds write indicates that the application failed to properly validate memory access boundaries during execution, allowing a process to write data beyond the allocated buffer space into adjacent memory regions. This type of flaw is particularly dangerous because it can corrupt critical program variables, overwrite return addresses on the stack, or modify function pointers in heap-allocated structures, thereby disrupting normal control flow and enabling arbitrary code execution with elevated privileges depending on the context in which the vulnerable library operates.
From a technical perspective, this vulnerability aligns closely with Common Weakness Enumeration identifier CWE-787, which classifies out-of-bounds writes as memory safety violations where data is written to a location outside of the intended buffer. Such errors typically stem from insufficient boundary checks when processing user-controlled input or internal system states that exceed expected limits. In the context of Android-based systems like One UI, libraries operating at higher privilege levels can leverage these corruption techniques to escalate privileges locally. An attacker who gains local access to the device could exploit this flaw by crafting a malicious payload designed to trigger the specific memory write condition within libsavscmn.so. By carefully controlling the data written beyond the buffer limits, the attacker can manipulate execution flow to execute arbitrary machine code, effectively gaining control over the affected process and potentially the entire system if privilege escalation is successful.
The operational impact of this vulnerability extends beyond simple application crashes or denial of service scenarios due to its potential for remote code execution capabilities when combined with local access vectors. Once an attacker achieves arbitrary code execution through this memory corruption flaw, they can install persistent malware, exfiltrate sensitive user data such as credentials and personal information, monitor communications, or use the compromised device as a pivot point within a broader network infrastructure. This aligns with several techniques in the MITRE ATT&CK framework for mobile platforms, particularly those related to privilege escalation and defense evasion. The ability to execute arbitrary code locally allows adversaries to bypass many standard security controls that rely on application sandboxing, thereby compromising the integrity of the entire device environment.
Mitigation strategies primarily involve applying the vendor-provided software updates that address this memory safety issue in One UI 8.5 and later versions. These patches likely include rigorous input validation mechanisms, bounds checking enhancements within the library code, or the implementation of modern compiler protections such as stack canaries, Address Space Layout Randomization (ASLR), and Control Flow Integrity (CFI) to mitigate exploitation attempts even if similar flaws exist elsewhere in the system. For organizations managing fleets of Samsung devices, it is imperative to enforce automatic security patching policies to ensure all endpoints are updated promptly upon release. Additionally, deploying mobile device management solutions that monitor for anomalous behavior or unauthorized privilege changes can provide an additional layer of defense against exploitation attempts targeting this specific vulnerability class until full remediation is achieved across the environment.