CVE-2022-29795 in HarmonyOS
Summary
by MITRE • 05/13/2022
The frame scheduling module has a null pointer dereference vulnerability. Successful exploitation of this vulnerability will affect the kernel availability.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/16/2022
The vulnerability identified as CVE-2022-29795 resides within the frame scheduling module of a kernel-based system, representing a critical null pointer dereference flaw that directly impacts system stability and availability. This type of vulnerability falls under the Common Weakness Enumeration category CWE-476 which specifically addresses NULL pointer dereference conditions where software attempts to access memory through a pointer that has not been properly initialized or has been set to null. The frame scheduling module typically manages temporal aspects of system operations including task scheduling and timing mechanisms that are fundamental to kernel functionality.
The technical flaw manifests when the kernel's frame scheduling component processes certain inputs or conditions that result in a null pointer being dereferenced during normal operation. This occurs when the scheduling module attempts to access memory locations through a pointer variable that contains a null value rather than a valid memory address. Such conditions typically arise from inadequate input validation or error handling within the scheduling algorithms that govern how system tasks are allocated and managed over time. When this null pointer dereference occurs, the kernel cannot continue processing the scheduling request and typically results in a system crash or panic that terminates the affected kernel thread or process.
The operational impact of this vulnerability extends beyond simple system instability to potentially enable denial of service attacks against kernel-level operations. Since the frame scheduling module is integral to how the operating system manages timing-sensitive tasks and resource allocation, exploitation of this null pointer dereference can cause cascading failures throughout the kernel subsystems. The vulnerability specifically affects kernel availability, meaning that successful exploitation will likely result in system crashes, requiring manual intervention or system reboot to restore normal operations. This makes the vulnerability particularly dangerous in environments where system uptime and reliability are critical such as enterprise servers, embedded systems, or real-time operating environments where continuous availability is paramount.
Mitigation strategies for CVE-2022-29795 should focus on implementing proper null pointer validation within the frame scheduling module and ensuring robust error handling mechanisms are in place. System administrators should prioritize applying vendor-provided patches or updates that address this specific null pointer dereference vulnerability. The mitigation approach aligns with the ATT&CK framework's defensive techniques for kernel-level protection, particularly those related to preventing privilege escalation and maintaining system integrity through proper input validation and error handling. Organizations should also implement monitoring solutions to detect potential exploitation attempts and establish incident response procedures specifically tailored to kernel-level vulnerabilities. Additionally, regular security assessments of kernel modules and proactive vulnerability scanning should be conducted to identify similar null pointer dereference conditions that may exist within other kernel subsystems, as these types of vulnerabilities often indicate broader code quality issues that could lead to additional security risks.