CVE-2021-26410 in Ryzen 5000 Desktop Processors with Radeon Graphics
Summary
by MITRE • 02/10/2026
Improper syscall input validation in ASP (AMD Secure Processor) may force the kernel into reading syscall parameter values from its own memory space allowing an attacker to infer the contents of the kernel memory leading to potential information disclosure.
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Analysis
by VulDB Data Team • 02/11/2026
The vulnerability identified as CVE-2021-26410 represents a critical flaw in the AMD Secure Processor (ASP) implementation that affects the kernel's syscall handling mechanism. This issue stems from insufficient validation of system call parameters, creating a pathway for malicious actors to exploit the processor's security boundaries. The vulnerability exists within the kernel's interaction with the AMD Secure Processor, which is designed to provide hardware-level security features including secure boot, trusted execution, and protected memory operations.
The technical root cause of this vulnerability lies in the improper validation of syscall inputs within the ASP subsystem. When the kernel processes system calls intended for the AMD Secure Processor, it fails to adequately validate the parameter values passed to these calls. This validation gap allows an attacker to craft malicious syscall parameters that cause the kernel to read memory locations from its own address space. The flaw specifically affects how the kernel interprets and handles input data during syscall processing, creating a condition where controlled memory reads can be executed through the legitimate syscall interface.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to infer sensitive kernel memory contents. This includes potentially exposing kernel data structures, memory layout information, and other confidential data that could be used to facilitate further attacks. The vulnerability's exploitation could enable an attacker to gather information about the kernel's internal state, which might reveal implementation details, memory addresses, or other sensitive data that could be leveraged for privilege escalation or other malicious activities. The information disclosure aspect of this vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of how inadequate parameter validation can lead to memory exposure issues.
The attack surface for this vulnerability is particularly concerning as it affects the core kernel functionality that manages secure processor operations. Any process running on the system that can make syscalls to the ASP interface could potentially exploit this weakness. The vulnerability demonstrates a fundamental breakdown in the kernel's security model, where legitimate system call processing becomes a vector for unauthorized memory access. From an attack perspective, this flaw could be exploited to gather kernel memory contents that might include sensitive data, implementation details, or other information that could aid in more sophisticated attacks.
Mitigation strategies for CVE-2021-26410 should focus on implementing proper syscall parameter validation within the ASP subsystem. System administrators should ensure that all kernel updates and patches are applied promptly, as this vulnerability typically requires kernel-level fixes to address the underlying validation issues. The implementation of proper input validation mechanisms within the syscall processing code is essential to prevent unauthorized memory access patterns. Additionally, monitoring systems should be configured to detect unusual syscall patterns that might indicate exploitation attempts. Security teams should also consider implementing memory protection mechanisms that limit the exposure of kernel memory contents and reduce the potential impact of information disclosure vulnerabilities. This vulnerability highlights the importance of proper validation controls in security-critical kernel components and aligns with ATT&CK technique T1059.001 for system shell execution and T1068 for exploit for privilege escalation.