FKIE_CVE-2026-46207

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-05-28 13:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix empty payload in tap skb for non-linear buffers For non-linear skbs, virtio_transport_build_skb() goes through virtio_transport_copy_nonlinear_skb() to copy the original payload in the new skb to be delivered to the vsockmon tap device. This manually initializes an iov_iter but does not set iov_iter.count. Since the iov_iter is zero-initialized, the copy length is zero and no payload is actually copied to the monitor interface, leaving data un-initialized. Fix this by removing the linear vs non-linear split and using skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as vhost-vsock already does. This handles both linear and non-linear skbs, properly initializes the iov_iter, and removes the now unused virtio_transport_copy_nonlinear_skb(). While touching this code, let's also check the return value of skb_copy_datagram_iter(), even though it's unlikely to fail.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s also check the return value of\nskb_copy_datagram_iter(), even though it\u0027s unlikely to fail."
    }
  ],
  "id": "CVE-2026-46207",
  "lastModified": "2026-05-28T13:44:01.663",
  "metrics": {},
  "published": "2026-05-28T10:16:36.340",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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