Critical Vulnerability in Linux Kernel: ALSA USB-Audio Power Domain Descriptor Validation
Summary
CVE-2025-38729: In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Validate UAC3 power domain descriptors, too UAC3 power domain descriptors need to be verified with its variable bLength for avoiding th... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interactions. It is known for its robustness, flexibility, and extensive support for various hardware architectures. However, like any complex software, it is susceptible to vulnerabilities. This particular issue affects the ALSA (Advanced Linux Sound Architecture) subsystem, specifically in the handling of USB audio devices, where improper validation of power domain descriptors can lead to security risks.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified related to the ALSA subsystem, specifically in the usb-audio driver. The issue arises from the failure to validate UAC3 (USB Audio Class 3) power domain descriptors properly. This oversight can lead to unexpected out-of-bounds (OOB) accesses when malicious firmware exploits the vulnerability. Such attacks could potentially compromise system integrity, leading to unauthorized access or system crashes.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the affected USB audio devices until the system is updated with the patched version. This can be done by removing the USB audio device from the system or disabling it in the system settings.
Conclusion
The vulnerability CVE-2025-38729 in the Linux kernel highlights the importance of validating power domain descriptors in USB audio devices. Users are encouraged to update their systems to the latest patched versions to mitigate potential risks. Utilizing tools like Vulert can help in monitoring and managing open-source vulnerabilities effectively.
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FAQ
CVE-2025-38729 is a vulnerability in the Linux kernel related to improper validation of USB audio power domain descriptors, which can lead to out-of-bounds accesses.
Exploitation of this vulnerability could allow malicious firmware to access system memory out of bounds, potentially leading to unauthorized access or system crashes.
Debian 11, 12, 13, and 14 are affected, with specific patched versions available for Debian 13 and 14.
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Yes, the permanent fix is to update the Linux package to the patched versions provided for your Debian distribution.
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