CVE-2022-50325 in Linux
Summary
by MITRE • 09/15/2025
In the Linux kernel, the following vulnerability has been resolved:
ASoC: Intel: avs: Fix potential RX buffer overflow
If an event caused firmware to return invalid RX size for LARGE_CONFIG_GET, memcpy_fromio() could end up copying too many bytes. Fix by utilizing min_t().
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Analysis
by VulDB Data Team • 01/10/2026
The vulnerability identified as CVE-2022-50325 resides within the Linux kernel's Advanced Speaker Output Configuration (ASoC) subsystem, specifically affecting Intel Audio Video Sync (AVS) audio drivers. This issue manifests in the handling of audio buffer operations during firmware communication, creating a potential buffer overflow condition that could compromise system stability and security. The flaw occurs in the context of audio hardware configuration where the system interacts with firmware to retrieve audio configuration parameters, particularly during LARGE_CONFIG_GET operations.
The technical root cause stems from improper bounds checking during memory copying operations within the audio driver's firmware communication pathway. When the firmware responds to a LARGE_CONFIG_GET event with an invalid receive buffer size, the memcpy_fromio() function attempts to copy more data than the allocated buffer can accommodate. This occurs because the system fails to properly validate the firmware-provided size parameter against the actual buffer capacity before initiating the memory copy operation. The vulnerability represents a classic buffer overflow scenario where insufficient input validation leads to memory corruption, potentially allowing attackers to overwrite adjacent memory regions with malicious data.
The operational impact of this vulnerability extends beyond simple system instability, as it could enable privilege escalation or arbitrary code execution within the kernel context. Attackers who can influence the firmware response or manipulate audio configurations may exploit this flaw to gain elevated privileges on systems running affected Linux kernels. The vulnerability affects systems utilizing Intel AVS audio hardware where the ASoC subsystem is active, particularly those implementing large configuration data transfers that require proper buffer size validation. This issue directly relates to CWE-121, which addresses stack-based buffer overflow conditions, and aligns with ATT&CK technique T1068, which covers exploitation of privilege escalation vulnerabilities.
Mitigation strategies for this vulnerability primarily involve applying the official kernel patch that implements proper bounds checking using the min_t() function to ensure that memory copy operations never exceed the allocated buffer boundaries. System administrators should prioritize updating to kernel versions that include this fix, particularly in environments where audio hardware is actively used and where security controls are paramount. The fix demonstrates proper defensive programming practices by utilizing kernel-provided macros designed to handle type-safe minimum value calculations, preventing the overflow condition through explicit size validation. Organizations should also implement monitoring for unusual audio configuration events or firmware responses that might indicate exploitation attempts, as the vulnerability requires specific conditions to be triggered through legitimate audio hardware interactions.