CVE-2026-53365

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: fix zerocopy completion for multi-skb sends

When a large message is fragmented into multiple skbs, the zerocopy

uarg is only allocated and attached to the last skb in the loop.

Non-final skbs carry pinned user pages with no completion tracking,

so the kernel has no way to notify userspace when those pages are safe

to reuse. If the loop breaks early the uarg is never allocated at all,

leaking pinned pages with no completion notification.

Fix this by following the approach used by TCP: allocate the zerocopy

uarg (if not provided by the caller) before the send loop and attach

it to every skb via skb_zcopy_set(), which takes a reference per skb.

Each skb's completion properly decrements the refcount, and the

notification only fires after the last skb is freed.

On failure, if no data was sent, the uarg is cleanly aborted via

net_zcopy_put_abort().

This issue was initially discovered by sashiko while reviewing commit

1cb36e252211 ("vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting")

but was pre-existing.