CVE-2025-38074 (GCVE-0-2025-38074)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2026-08-05 11:59
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
Version: 057cbf49a1f08297877e46c82f707b1bfea806a8
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{
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        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:33:42.169Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        "title": "CVE Program Container"
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    "cna": {
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          "vendor": "Linux",
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      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - vhost-scsi is a host-kernel backend driven by a guest VM through its virtqueues and by the VMM through /dev/vhost-scsi ioctls; there is no network-facing path, so the attacker acts from a local context (inside a guest on the host, or a local host process holding the vhost fd).\nAC:L - The attacker controls both sides of the race \u2014 a continuous stream of guest SCSI I/O keeps the unlocked completion worker running, and a guest-initiated virtio device reset forces QEMU\u0027s vhost_dev_stop() to clear log_used and free the log bitmap; the window is wide because the entire completion loop ran with no lock at all, and each command issues multiple log_write() calls.\nPR:L - The attacker needs to be an authorized guest tenant driving the virtio-scsi device (or a local host process with the vhost-scsi fd); no host root or elevated host capability is required, and ordinary unprivileged guest I/O suffices to keep the completion path armed.\nUI:N - No victim action is needed \u2014 the guest can itself force the log-teardown path via a virtio device reset or feature renegotiation while completions are in flight, and the migration-end teardown is a routine automated host operation, not a tricked user action.\nS:C - The vulnerable component is the host kernel\u0027s vhost-scsi driver, but the corrupted resource is the host VMM (QEMU) userspace address space, reached from inside a guest \u2014 the guest confinement boundary is crossed, matching the guest-to-host escape case.\nC:H - Guest-influenced bit-sets at attacker-chosen offsets from a stale log_base corrupt live QEMU heap objects (pointers, lengths, migration bitmap state), which is leverageable to disclose host memory back into the guest.\nI:H - This is an out-of-bounds/use-after-free write into the host VMM process with attacker-controlled offset and multiplicity, enabling corruption of QEMU control structures and hence control-flow hijack, and it silently corrupts the migration dirty bitmap so migrated guest state is written incorrectly.\nA:H - Corrupting glib heap metadata aborts QEMU and terminates the VM, migrations fail or complete with corrupt state, and set_bit_to_user()\u0027s BUG_ON(r != 1) can be reached when the stale log page is no longer pinnable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:14.881Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/80cf68489681c165ded460930e391b1eb37b5f6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8312a1ccff1566f375191a89b9ba71b6eb48a8cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/59614c5acf6688f7af3c245d359082c0e9e53117"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca85c2d0db5f8309832be45858b960d933c2131c"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd8c9404e44adb9f6219c09b3409a61ab7ce3427"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0039e3afda29be469d29b3013d7f9bdee136834"
        },
        {
          "url": "https://git.kernel.org/stable/c/f591cf9fce724e5075cc67488c43c6e39e8cbe27"
        }
      ],
      "title": "vhost-scsi: protect vq-\u003elog_used with vq-\u003emutex",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38074",
    "datePublished": "2025-06-18T09:33:50.006Z",
    "dateReserved": "2025-04-16T04:51:23.980Z",
    "dateUpdated": "2026-08-05T11:59:14.881Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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