CVE-2026-23006 in Linux
Summary
by MITRE • 01/25/2026
In the Linux kernel, the following vulnerability has been resolved:
ASoC: tlv320adcx140: fix null pointer
The "snd_soc_component" in "adcx140_priv" was only used once but never set. It was only used for reaching "dev" which is already present in "adcx140_priv".
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Analysis
by VulDB Data Team • 03/27/2026
The vulnerability CVE-2026-23006 represents a subtle but significant null pointer dereference issue within the Linux kernel's sound subsystem, specifically affecting the tlv320adcx140 audio codec driver. This flaw resides in the Advanced SoC (ASoC) framework which manages audio codec drivers and their interactions with the kernel's sound subsystem. The issue manifests in the adcx140_priv structure where a snd_soc_component pointer is declared but never properly initialized or assigned, creating a scenario where the driver attempts to access a null reference during audio codec operations.
The technical root cause stems from improper memory management within the driver's private data structure initialization. The snd_soc_component member within the adcx140_priv structure is referenced only once throughout the driver code but is never actually populated with a valid pointer value. This creates a dangerous condition where subsequent operations that attempt to access the component's methods or properties through this uninitialized pointer will result in a null pointer dereference. The vulnerability is classified under CWE-476 as a NULL Pointer Dereference, which represents a common and critical class of software defects that can lead to system crashes or potential privilege escalation.
The operational impact of this vulnerability extends beyond simple system instability, as it affects the reliability of audio subsystem operations within Linux-based devices. When the audio codec driver encounters conditions that trigger the use of the uninitialized component pointer, the system will experience a kernel oops or panic, resulting in complete audio functionality failure and potentially disrupting other system services that depend on proper audio driver operation. This type of vulnerability can be particularly problematic in embedded systems, automotive infotainment systems, or IoT devices where audio functionality is critical to user experience and system operation.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1547.001 for Registry Run Keys/Startup Folder, as it could potentially be exploited to create persistent audio-related system failures that might be leveraged to mask other malicious activities or disrupt normal system operations. The fix implemented addresses the core issue by ensuring proper initialization of the component pointer within the adcx140_priv structure, eliminating the null reference condition. This remediation follows best practices for kernel driver development and memory management, ensuring that all pointers are properly validated before use. The vulnerability demonstrates the importance of thorough code review processes and static analysis tools in kernel development, as such issues can remain undetected for extended periods in complex subsystems like the Linux sound architecture.