CyberRota Analysis
AI-GeneratedA vulnerability in the Linux kernel affects the virtio transport layer, where improper handling of zerocopy socket buffers can lead to memory management issues, potentially resulting in denial of service due to skb allocation failures. This high-severity flaw could be exploited in environments utilizing virtualized networking, particularly those relying on the virtio framework. System administrators and security teams managing Linux-based systems, especially in cloud or containerized environments, should prioritize applying patches to mitigate this risk.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: bind uarg before filling zerocopy skb virtio_transport_send_pkt_info() allocates or reuses the zerocopy uarg before entering the send loop, but virtio_transport_alloc_skb() still fills the skb before it inherits that uarg. When fixed-buffer vectored zerocopy hits MAX_SKB_FRAGS, io_sg_from_iter() may partially attach managed frags and return -EMSGSIZE. The rollback path call kfree_skb() to free an skb that carries SKBFL_MANAGED_FRAG_REFS but no uarg, so skb_release_data() falls through to ordinary frag unref. Pass the uarg into virtio_transport_alloc_skb() and bind it immediately before virtio_transport_fill_skb(). This keeps control or no-payload skbs untouched while ensuring success and rollback share one lifetime rule.