CVE-2025-37805: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-37805 is a vulnerability discovered in the Linux kernel's sound/virtio subsystem, reported on May 8, 2025. The issue involves uninitialized work_structs in the virtual sound device driver that can trigger warning messages during system operation (NVD, Red Hat).

The vulnerability occurs in the error path of virtsndprobe(), which triggers virtsndremove() and iterates over substreams calling cancelworksync() on the elapsedperiod workstruct. The issue manifests when snd->nsubstreams is set and substreams are allocated, but an error occurs during info allocation or virtsndctlqueryinfo() failure, leading to uninitialized workstruct cleanup attempts. The vulnerability has been assigned a CVSS v3.1 score of 5.5 (Moderate) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (Red Hat).

The vulnerability's impact is primarily related to system stability and reliability rather than security. When triggered, it causes warning messages to appear in the system log and could potentially lead to system instability, though no data corruption or security breach has been reported (Red Hat).

A fix has been developed that initializes the substreams structure immediately after allocation, preventing cleanup attempts on uninitialized data. The patch was suggested by Takashi Iwai and has undergone initial testing, though reproduction of the issue has been limited (NVD).