CVE-2026-24928 in HarmonyOS
Summary
by MITRE • 02/06/2026
Out-of-bounds write vulnerability in the file system module. Impact: Successful exploitation of this vulnerability may affect service confidentiality.
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Analysis
by VulDB Data Team • 02/09/2026
This vulnerability represents a critical out-of-bounds write condition within the file system module of the affected system, classified under CWE-787 Out-of-bounds Write. The flaw occurs when the system processes file operations without proper bounds checking, allowing malicious input to overwrite adjacent memory locations. Such vulnerabilities typically arise from insufficient validation of input parameters during file handling operations, particularly when dealing with user-supplied file names, paths, or metadata. The vulnerability exists at the kernel level or core file system driver, making it particularly dangerous as it can be exploited by attackers to gain unauthorized access to system resources and potentially escalate privileges. The out-of-bounds write can corrupt critical data structures, leading to unpredictable behavior and potential system instability.
The operational impact of this vulnerability extends beyond simple confidentiality concerns as outlined in the description. While the primary concern is service confidentiality, exploitation could enable attackers to access sensitive data stored within the file system, modify critical system files, or even execute arbitrary code within the system's privilege context. This type of vulnerability can be leveraged in conjunction with other attack vectors to establish persistent access or to conduct data exfiltration operations. The attack surface is particularly broad since file system operations are fundamental to virtually all system functions, making this vulnerability potentially exploitable through various attack paths including web applications, file transfer protocols, or direct system interfaces.
Security practitioners should recognize this vulnerability as a potential candidate for exploitation through techniques described in the ATT&CK framework under T1059 Command and Scripting Interpreter and T1566 Phishing, where attackers might craft malicious files to trigger the out-of-bounds write condition. The vulnerability's exploitation typically requires careful crafting of input data that bypasses normal validation mechanisms, potentially involving malformed file names, extended attributes, or specially constructed file system structures. Mitigation strategies should include immediate patch deployment from vendors, implementation of input validation controls, and enhanced monitoring for unusual file system access patterns. Additionally, system hardening measures such as address space layout randomization, stack canaries, and kernel address space protection should be enabled to reduce the effectiveness of exploitation attempts. The vulnerability demonstrates the critical importance of proper bounds checking in system-level code and highlights the need for comprehensive security testing including fuzzing and formal verification of core system components. Organizations should conduct thorough risk assessments to determine the potential impact on their specific environments and implement layered defensive measures to protect against exploitation attempts targeting this class of vulnerability.