CVE-2026-52994

Summary

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

vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement.

Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count.

This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1
• https://git.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff
• https://git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80

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