CVE-2025-39997

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition leading to a Use-After-Free (UAF) issue exists in the ALSA subsystem, specifically within the snd usbmidi free function related to USB audio. A previous commit aimed to address a UAF, but the fix introduced a race condition where memory could still be accessed after being freed, potentially due to missing cleanup for URB (USB Request Block). This can occur in interrupt context related to URB, leading to a UAF. The issue stems from the order in which the error timer and URB are killed relative to freeing heap memory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.