CVE-2025-39757 ALSA: usb-audio: Validate UAC3 cluster segment descriptors
A malicious USB audio device can trigger out-of-bounds memory access in the Linux kernel, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-39757?
CVE-2025-39757 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 11 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb-audio: Validate UAC3 cluster segment descriptors
UAC3 class segment descriptors need to be verified whether their sizes match with the declared lengths and whether they fit with the allocated buffer sizes, too. Otherwise malicious firmware may lead to the unexpected OOB accesses.
Weakness: CWE-125
Which versions are affected by CVE-2025-39757?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-39757?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-39757 being exploited?
There is no known exploitation of CVE-2025-39757 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-67229, AZL-73956, BELL-CVE-2025-39757, DEBIAN-CVE-2025-39757, GHSA-jrpg-g4vf-p4hw, ROOT-OS-DEBIAN-11-CVE-2025-39757 and 4 more.