CVE-2026-23083

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

Published: 2/4/2026 Last updated: 5/11/2026 Reserved: 1/13/2026

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.

CNA assigner: Linux (416baaa9-dc9f-4396-8d5f-8c081fb06d67) Requested by: n/a

Opam packages affected (29)

albatross cdrom conf-bpftool conf-libbpf conf-linux-libc-dev core core_unix hvsock mirage-block-unix mm ocaml-probes ortools_solvers orun rawlink rawlink-eio rawlink-lwt restricted shell solo5 solo5-bindings-hvt solo5-bindings-spt solo5-cross-aarch64 solo5-kernel-ukvm tracy-client tuntap uring vhd-format vhd-format-lwt xapi-stdext-unix

Products affected (4)

Product	Vendor	Version
Linux	Linux	6.3.0 prior to 6.3.0r24
Linux	Linux	n/a
Linux	Linux	10 Version 1809 for 32-bit Systems
Linux	Linux	2019

CVE-2026-23083

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

Opam packages affected (29)

Products affected (4)

References (14)