CVE-2025-38074

vhost-scsi: protect vq->log_used with vq->mutex

MEDIUM

5.5

CVSS Score

Published: June 18, 2025 at 09:33 AM UTC

Updated: August 5, 2026 at 12:44 PM UTC

2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

11.0

Linux Kernel · Linux

95%

v < 5.10.2403.6 ≤ v < 5.10.2403.6 ≤ v < 5.15.1893.6 ≤ v < 6.1.1463.6 ≤ v < 6.12.313.6 ≤ v < 6.14.93.6 ≤ v < 6.153.6 ≤ v < 6.6.935.11 ≤ v < 5.15.1895.16 ≤ v < 6.1.1466.13 ≤ v < 6.14.96.2 ≤ v < 6.6.936.7 ≤ v < 6.12.3157cbf49a1f8297877e46c82f707b1bfea806a86.15 rc1 6.15 rc2 6.15 rc3

Vendor states this is fixed in 59614c5acf6688f7af3c245d359082c0e9e53117 (fixed)

Vendor states this is fixed in 80cf68489681c165ded460930e391b1eb37b5f6f (fixed)

Vendor states this is fixed in 8312a1ccff1566f375191a89b9ba71b6eb48a8cd (fixed)

Vendor states this is fixed in bd8c9404e44adb9f6219c09b3409a61ab7ce3427 (fixed)

Vendor states this is fixed in c0039e3afda29be469d29b3013d7f9bdee136834 (fixed)

Vendor states this is fixed in ca85c2d0db5f8309832be45858b960d933c2131c (fixed)

Vendor states this is fixed in f591cf9fce724e5075cc67488c43c6e39e8cbe27 (fixed)

Vendor states this is fixed in 3.6 (unaffected)

Vendor states this is fixed in 5.10.240 (unaffected)

Vendor states this is fixed in 5.15.189 (unaffected)

Vendor states this is fixed in 6.1.146 (unaffected)

Vendor states this is fixed in 6.12.31 (unaffected)