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CVE-2026-23083

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

EPSS 0.1%
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.
Affected products
Linux · Linux

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References
https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91eahttps://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03