CVE-2025-38074: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: vhost-scsi: protect vq->log_used with vq->mutex The vhost-scsi completion path may access vq->log_base when vq->log_used is already set to false. vhost-thread QEMU-thread vhost_scsi_complete_cmd_work() -> vhost_add_used() -> vhost_add_used_n() if (unlikely(vq->log_used)) QEMU disables vq->log_used via VHOST_SET_VRING_ADDR. mutex_lock(&vq->mutex); vq->log_used = false now! mutex_unlock(&vq->mutex); QEMU gfree(vq->log_base) log_used() -> log_write(vq->log_base) Assuming the VMM is QEMU. The vq->log_base is from QEMU userpace and can be reclaimed via gfree(). As a result, this causes invalid memory writes to QEMU userspace. The control queue path has the same issue.

Affected products

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: before 5.10.240 (fixed in 5.10.240); from 5.11, before 5.15.189 (fixed in 5.15.189); from 5.16, before 6.1.146 (fixed in 6.1.146); from 6.2, before 6.6.93 (fixed in 6.6.93); from 6.7, before 6.12.31 (fixed in 6.12.31); from 6.13, before 6.14.9 (fixed in 6.14.9); …

Published 2025-06-18. Last modified 2026-07-30.