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CVE-2026-63970 is a Linux kernel memory-safety flaw in the vsock/virtio transport send path involving zerocopy skb handling. In virtio_transport_send_pkt_info(), a zerocopy user argument object is allocated or reused before the send loop, but the skb allocation path in virtio_transport_alloc_skb() previously filled the skb before that skb inherited the uarg. Under fixed-buffer vectored zerocopy conditions, when io_sg_from_iter() reaches MAX_SKB_FRAGS, it can partially attach managed fragments and return -EMSGSIZE. The error rollback path then calls kfree_skb() on an skb carrying managed fragment references but lacking the associated uarg. As a result, skb_release_data() follows the ordinary fragment unreference path instead of the managed-fragment lifetime path, creating incorrect ownership and reference handling that can lead to a use-after-free condition in kernel memory. The fix passes the uarg into virtio_transport_alloc_skb() and binds it before virtio_transport_fill_skb(), ensuring both successful and rollback paths follow the same lifetime rules.
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Cross-references every affected SKU, including bundled OEM variants.
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