GHSA-7P5H-9PP6-5WQC
Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-12-17 21:30In 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": [],
"aliases": [
"CVE-2025-38074"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T10:15:40Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost-scsi: protect vq-\u003elog_used with vq-\u003emutex\n\nThe vhost-scsi completion path may access vq-\u003elog_base when vq-\u003elog_used is\nalready set to false.\n\n vhost-thread QEMU-thread\n\nvhost_scsi_complete_cmd_work()\n-\u003e vhost_add_used()\n -\u003e vhost_add_used_n()\n if (unlikely(vq-\u003elog_used))\n QEMU disables vq-\u003elog_used\n via VHOST_SET_VRING_ADDR.\n mutex_lock(\u0026vq-\u003emutex);\n vq-\u003elog_used = false now!\n mutex_unlock(\u0026vq-\u003emutex);\n\n\t\t\t\t QEMU gfree(vq-\u003elog_base)\n log_used()\n -\u003e log_write(vq-\u003elog_base)\n\nAssuming the VMM is QEMU. The vq-\u003elog_base is from QEMU userpace and can be\nreclaimed via gfree(). As a result, this causes invalid memory writes to\nQEMU userspace.\n\nThe control queue path has the same issue.",
"id": "GHSA-7p5h-9pp6-5wqc",
"modified": "2025-12-17T21:30:31Z",
"published": "2025-06-18T12:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38074"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/59614c5acf6688f7af3c245d359082c0e9e53117"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80cf68489681c165ded460930e391b1eb37b5f6f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8312a1ccff1566f375191a89b9ba71b6eb48a8cd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bd8c9404e44adb9f6219c09b3409a61ab7ce3427"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c0039e3afda29be469d29b3013d7f9bdee136834"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ca85c2d0db5f8309832be45858b960d933c2131c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f591cf9fce724e5075cc67488c43c6e39e8cbe27"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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