CVE-2026-53205 in Linux
Summary
by MITRE • 06/25/2026
In the Linux kernel, the following vulnerability has been resolved:
accel/ivpu: Add bounds checks for firmware log indices
Add validation that read and write indices in the firmware log buffer are within valid bounds (< data_size) before using them. If out-of-bounds indices are encountered (from firmware), clamp them to safe values instead of proceeding with invalid offsets.
This prevents potential out-of-bounds buffer access when firmware supplies invalid log indices.
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Analysis
by VulDB Data Team • 06/25/2026
The vulnerability addressed in this linux kernel patch represents a critical bounds checking issue within the intel virtualization processing unit acceleration driver. This flaw exists in the accelivpu subsystem which handles firmware communication for hardware acceleration tasks. The specific vulnerability occurs when the kernel processes log buffer indices provided by firmware components, creating a potential avenue for malicious code execution or system instability through improper memory access patterns.
The technical implementation of this vulnerability stems from insufficient validation of read and write indices within the firmware log buffer structure. When firmware components provide invalid indices that exceed the allocated buffer boundaries, the kernel fails to perform proper bounds checking before accessing memory locations. This absence of input validation creates a classic out-of-bounds memory access condition that can be exploited by malicious firmware or compromised system components.
From an operational standpoint, this vulnerability presents significant security implications for systems utilizing intel virtualization processing units, particularly in server and embedded environments where firmware integrity cannot be guaranteed. The potential impact includes system crashes, data corruption, privilege escalation opportunities, and denial of service conditions that could affect critical infrastructure operations. Attackers with access to modify firmware or manipulate communication channels could exploit this weakness to gain unauthorized system control.
The mitigation strategy implemented in this patch follows established security best practices by introducing proactive bounds validation mechanisms. The solution enforces strict validation that ensures all read and write indices remain within acceptable limits defined by the data_size parameter of the firmware log buffer. When invalid indices are detected, the system employs a clamping mechanism that safely adjusts these values to valid buffer boundaries rather than allowing potentially dangerous memory access operations to proceed.
This vulnerability aligns with common weakness enumerations such as cwe 129 and cwe 787 which specifically address improper bounds checking and out-of-bounds memory access conditions. The fix demonstrates adherence to defensive programming principles and follows attack technique patterns documented in the mitre att&ck framework under techniques related to privilege escalation and code execution through memory corruption vulnerabilities. The patch represents a fundamental security enhancement that strengthens kernel resilience against malformed firmware inputs while maintaining system functionality and performance characteristics.