{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46207",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46207"
  ],
  "published": "2026-05-28T09:40:54Z",
  "summary": "vsock/virtio: fix empty payload in tap skb for non-linear buffers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix empty payload in tap skb for non-linear buffers\n\nFor non-linear skbs, virtio_transport_build_skb() goes through\nvirtio_transport_copy_nonlinear_skb() to copy the original payload\nin the new skb to be delivered to the vsockmon tap device.\nThis manually initializes an iov_iter but does not set iov_iter.count.\nSince the iov_iter is zero-initialized, the copy length is zero and no\npayload is actually copied to the monitor interface, leaving data\nun-initialized.\n\nFix this by removing the linear vs non-linear split and using\nskb_copy_datagram_iter() with iov_iter_kvec() for all cases, as\nvhost-vsock already does. This handles both linear and non-linear skbs,\nproperly initializes the iov_iter, and removes the now unused\nvirtio_transport_copy_nonlinear_skb().\n\nWhile touching this code, let's also check the return value of\nskb_copy_datagram_iter(), even though it's unlikely to fail.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46207"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}