CVE-2026-64133 in Linux
Summary
by MITRE • 07/19/2026
In the Linux kernel, the following vulnerability has been resolved:
ALSA: asihpi: Fix potential OOB array access at reading cache
find_control() to retrieve a cached info accesses the array with the given index blindly, which may lead to an OOB array access. Add a sanity check for avoiding it.
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Analysis
by VulDB Data Team • 07/19/2026
The vulnerability resides within the Advanced Linux Sound Architecture ALSA subsystem specifically in the asihpi driver component responsible for handling audio hardware interfaces. This issue manifests as a potential out-of-bounds array access condition that could be exploited to compromise system stability or potentially execute arbitrary code. The flaw occurs during the retrieval of cached control information through the find_control() function which processes array indices without proper validation checks.
The technical implementation of this vulnerability stems from a fundamental programming error where the function accesses memory arrays using user-provided or internally calculated indices without verifying that these indices fall within acceptable bounds. This represents a classic buffer overflow condition that can be categorized under CWE-129 as "Improper Validation of Array Index." The absence of bounds checking in the array access operation allows for potential memory corruption when invalid indices are processed, particularly during cache retrieval operations where the system attempts to access control information structures.
Operationally, this vulnerability presents a significant risk to systems running Linux kernels with ALSA support, especially those utilizing audio hardware that relies on the asihpi driver. An attacker could potentially trigger the out-of-bounds access through malformed input or crafted audio control requests that cause the find_control() function to process invalid array indices. This could result in system crashes, denial of service conditions, or more severe consequences if proper memory corruption occurs that allows for code execution. The impact is particularly concerning in embedded systems or server environments where audio processing is critical and system stability is paramount.
The mitigation strategy involves implementing proper bounds checking within the find_control() function to validate array indices before any access operations occur. This aligns with defensive programming practices recommended by the ATT&CK framework under technique T1059 for command and scripting interpreter usage, ensuring that memory operations are properly validated. The fix requires adding sanity checks that verify index values against array dimensions, preventing unauthorized memory access patterns. Additionally, system administrators should ensure timely kernel updates that include this patch to maintain security posture against potential exploitation attempts targeting audio subsystem vulnerabilities.
This vulnerability demonstrates the critical importance of input validation in kernel space operations and highlights how seemingly minor flaws in device driver implementations can lead to significant security implications. The fix represents a standard defensive programming approach that prevents memory corruption issues while maintaining system functionality, ensuring that audio control operations proceed safely within defined boundaries and preventing potential escalation to more severe compromise scenarios.
The resolution of this issue underscores the necessity for comprehensive code review processes in kernel development environments, particularly for drivers handling user-facing hardware interfaces. The vulnerability serves as a reminder that even specialized subsystems like audio processing require rigorous security validation to prevent exploitation through memory corruption attacks that could affect overall system integrity and availability.