{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74580",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74580"
  ],
  "published": "2026-08-21T16:32:04Z",
  "summary": "vhost: reset the vring metadata cache on vring reconfiguration",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring\nmetadata region, and iotlb_access_ok() returns early on a cache hit,\ntaking the hit as proof that the region has already been validated:\n\n\tif (vhost_vq_meta_fetch(vq, addr, len, type))\n\t\treturn true;\n\nThe cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on\ndevice IOTLB (re)initialisation and on vq reset, but not when\nVHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when\nVHOST_SET_VRING_NUM changes the region sizes.\n\nWith a device IOTLB attached both ioctls are accepted while the vq is\nlive, and neither validates the addresses at ioctl time: vq_access_ok()\nand vq_log_used_access_ok() return true early because the addresses are\nGIOVAs, deferring validation to prefetch time.  Once the cache has been\npopulated that deferred validation no longer runs -- vq_meta_prefetch()\nhits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps\ntranslating through the old mapping as\n\n\tmap->addr + addr - map->start\n\nfor an address the mapping no longer covers.  vhost_copy_to_user() and\nvhost_copy_from_user() consume the result with __copy_to_user() and\n__copy_from_user(), which do not check it either, so a subsequent used\nring update or descriptor fetch accesses memory outside the region the\nIOTLB actually maps.\n\nReset the metadata cache whenever the vring is reconfigured, so the new\naddresses are pushed back through iotlb_access_ok()'s slow path.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74580"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95"
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      "url": "https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a"
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    },
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      "url": "https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b"
    },
    {
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      "url": "https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6"
    },
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    },
    {
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires ioctl on /dev/vhost-net or /dev/vhost-vsock (VHOST_SET_OWNER, VHOST_SET_FEATURES with VIRTIO_F_ACCESS_PLATFORM, VHOST_SET_VRING_ADDR, IOTLB updates); although virtio kicks and network I/O trigger the corrupting copies, the stale-cache state is created only through local vhost character-device syscalls, not remote packets.\nAC:L - An attacker who controls the vhost owner process can deterministically populate meta_iotlb via normal virtqueue traffic, issue VHOST_SET_VRING_ADDR with new GIOVAs while the backend is live, then trigger descriptor/used-ring access; no races, special heap layout, or victim timing are required.\nPR:L - No host root is needed: exploitation is performed by the vhost device owner (standard libvirt/QEMU kvm-group account) or, in the highest-impact cloud scenario, an authorized malicious VM tenant whose virtio traffic drives vhost workers after QEMU updates live vring addresses under VIRTIO_F_ACCESS_PLATFORM.\nUI:N - No end-user or administrator action is required beyond routine automated VM operation (virtio I/O, vhost backend attachment, and vring setup) that the attacker or tenant controls directly.\nS:C - Stale IOTLB metadata translation makes the host kernel read/write outside the mapped vring regions in the VMM userspace address space (QEMU), crossing the guest-to-host virtualization boundary\u2014the same escape class as CVE-2025-38074, not mere in-guest kernel impact.\nC:H - vhost_copy_from_user and __vhost_get_user use vhost_vq_meta_fetch's stale map->addr+addr-map->start translation without bounds checks, enabling out-of-bounds reads of adjacent VMM memory during descriptor and avail-ring fetches (arbitrary misdirected kernel reads from host userspace).\nI:H - vhost_copy_to_user and vhost_put_user write used-ring entries through the same stale translation, giving controlled out-of-bounds writes into the VMM process that can corrupt QEMU heap, IOTLB tables, or migration metadata for code-execution primitives.\nA:H - Misdirected __copy_to_user/__copy_from_user against unmapped or invalid VMM addresses can fault the vhost worker (host kernel oops/panic), and corrupting VMM control structures reliably crashes or kills the hypervisor process, terminating the VM."
    }
  }
}