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

ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops

fib_nlmsg_size() still estimates nexthop space as if every gateway is
encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an
IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.

As a result, route notifications can allocate an skb that is too small.
fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the
WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With
panic_on_warn set, this becomes a kernel panic.

Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for
IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop
layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is
actually present.

https://git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385

https://git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295

https://git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397

https://git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324

https://git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3

https://git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395

https://git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb

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