CVE-2025-38074 (GCVE-0-2025-38074)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-01-02 15:30
VLAI?
Title
vhost-scsi: protect vq->log_used with vq->mutex
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < 80cf68489681c165ded460930e391b1eb37b5f6f (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < 8312a1ccff1566f375191a89b9ba71b6eb48a8cd (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < 59614c5acf6688f7af3c245d359082c0e9e53117 (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < ca85c2d0db5f8309832be45858b960d933c2131c (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < bd8c9404e44adb9f6219c09b3409a61ab7ce3427 (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < c0039e3afda29be469d29b3013d7f9bdee136834 (git)
Affected: 057cbf49a1f08297877e46c82f707b1bfea806a8 , < f591cf9fce724e5075cc67488c43c6e39e8cbe27 (git)
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    Linux Linux Affected: 3.6
Unaffected: 0 , < 3.6 (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.93 , ≤ 6.6.* (semver)
Unaffected: 6.12.31 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "value": "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."
        }
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/80cf68489681c165ded460930e391b1eb37b5f6f"
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        {
          "url": "https://git.kernel.org/stable/c/8312a1ccff1566f375191a89b9ba71b6eb48a8cd"
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        {
          "url": "https://git.kernel.org/stable/c/f591cf9fce724e5075cc67488c43c6e39e8cbe27"
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      "title": "vhost-scsi: protect vq-\u003elog_used with vq-\u003emutex",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38074",
    "datePublished": "2025-06-18T09:33:50.006Z",
    "dateReserved": "2025-04-16T04:51:23.980Z",
    "dateUpdated": "2026-01-02T15:30:04.884Z",
    "state": "PUBLISHED"
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