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CVE-2026-46321 is a Linux kernel memory management flaw in the tun/tap XDP transmit path, specifically in tun_xdp_one(). When a frame shorter than ETH_HLEN is processed, tun_xdp_one() returns -EINVAL but fails to free the page previously allocated by vhost_net_build_xdp(). Because tun_sendmsg() discards that -EINVAL and still returns total_len, vhost_tx_batch() follows the success path and does not release the allocation. As a result, each rejected short frame in a batch leaks one page-frag chunk. An attacker can trigger this by attaching a tun/tap device as the vhost-net backend and submitting TX descriptors whose payload length, after subtracting the virtio-net header, is below ETH_HLEN. Repeated submission causes unbounded kernel memory leakage. The fix is to free the page before returning -EINVAL, consistent with the existing XDP-program error path in the same function.
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