CVE-2026-74294 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
ASoC: meson: aiu: Validate written enum values
The AIU HDMI and internal codec mux put callbacks use the written enum value with snd_soc_enum_item_to_val() before checking whether the value is valid for the enumeration.
Reject out-of-range values before converting the enum item, matching the validation already done by the G12A HDMI and internal codec mux controls.
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability in question affects the Linux kernel's sound subsystem specifically within the meson audio driver implementation. This issue resides in the Advanced SoC (ASoC) framework where the AIU HDMI and internal codec mux put callbacks fail to validate enum values before processing them through snd_soc_enum_item_to_val() function. The root cause stems from a missing validation check that should occur prior to enum value conversion, creating a potential pathway for invalid data processing.
The technical flaw manifests when the system attempts to handle enumerated values for HDMI and internal codec mux controls without first ensuring these values fall within the acceptable range defined by the enumeration. This oversight allows out-of-range enum values to be passed directly to the conversion function, potentially leading to unpredictable behavior or memory corruption within the audio subsystem. The vulnerability specifically impacts devices using the meson SoC architecture where the AIU (Audio Interface Unit) handles audio routing between various codec components and HDMI outputs.
Operational impact of this vulnerability extends beyond simple functional degradation as it represents a potential security risk within embedded systems that rely on the Linux kernel for audio processing. Attackers could potentially exploit this weakness to manipulate audio routing decisions, potentially causing system instability or creating unauthorized access points through malformed audio control commands. The vulnerability affects systems where HDMI audio output and internal codec switching functionality is utilized, particularly in set-top boxes, smart TVs, and other embedded multimedia devices running Linux-based operating systems.
The fix implemented addresses this by introducing proper validation of enum values before they are processed through the conversion function, aligning the behavior with existing validation patterns already present in the G12A HDMI and internal codec mux controls. This remediation follows established security practices for input validation and helps prevent potential buffer overflows or other memory corruption issues that could arise from processing invalid enumeration data. The solution ensures consistency across similar audio control implementations within the same driver family and demonstrates adherence to secure coding principles.
This vulnerability type relates to CWE-129: Improper Validation of Array Index and CWE-704: Incorrect Type Conversion or Cast in its manifestation. The fix aligns with ATT&CK techniques focusing on privilege escalation through kernel vulnerabilities and defensive measures against malicious input processing. The remediation approach follows industry best practices for preventing invalid data processing in kernel drivers, particularly within the ASoC subsystem where audio routing decisions directly impact system functionality and security posture.