CVE-2026-21384 in Snapdragon
Summary
by MITRE • 07/06/2026
Memory Corruption when updating prepared commands with invalid port indices based on user space input exceeds supported read client limits.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/06/2026
This vulnerability represents a memory corruption issue that occurs within database management systems when processing prepared commands containing invalid port indices derived from user-supplied input. The flaw manifests when client applications submit malformed data structures that specify port indices exceeding the system's supported read client limits, leading to unpredictable memory behavior and potential exploitation opportunities. The root cause lies in insufficient validation of port index values during command preparation phases, where the system fails to properly bounds-check user-provided parameters before incorporating them into internal memory management operations.
The technical implementation of this vulnerability stems from inadequate input sanitization mechanisms within the database engine's prepared statement handling subsystem. When a client sends a prepared command with an invalid port index, the system's memory allocator receives malformed parameters that can cause buffer overflows, heap corruption, or arbitrary memory writes depending on the specific implementation details and memory layout. This type of vulnerability typically maps to CWE-121 Stack-based Buffer Overflow or CWE-787 Out-of-bounds Write classifications within the Common Weakness Enumeration framework, as it involves writing data beyond allocated memory boundaries through improper index validation.
Operational impacts of this vulnerability extend beyond immediate system stability concerns to encompass potential privilege escalation and data integrity breaches. An attacker exploiting this flaw could manipulate memory contents to execute arbitrary code within the database process context, potentially gaining elevated privileges or accessing sensitive information stored in memory. The vulnerability's exploitation requires careful crafting of malformed prepared commands that specifically target the port index validation logic, making it moderately sophisticated but not overly complex to implement in practice. The attack surface is particularly concerning in multi-tenant database environments where one client could potentially affect others through shared memory corruption.
Mitigation strategies should focus on implementing comprehensive input validation at multiple layers of the database architecture, including immediate bounds checking of port indices before any memory allocation occurs. Database administrators should enforce strict parameter validation policies and consider implementing memory protection mechanisms such as stack canaries, address space layout randomization, and heap integrity checks to detect and prevent exploitation attempts. Regular security updates and patches addressing known vulnerabilities in database engines are essential, while monitoring systems should be deployed to detect anomalous prepared command patterns that might indicate attempted exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1059 Command and Scripting Interpreter and potentially T1203 Exploitation for Client Execution, emphasizing the need for both defensive measures and active threat detection capabilities in database environments.