fou: Don't allow 0 for FOU_ATTR_IPPROTO.

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In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.

Source published

4 Feb 2026 16:08:07 UTC

Source modified

19 Oct 2026 18:25:29 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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