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

netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

The nf_osf_ttl() function accessed skb->dev to perform a local interface
address lookup without verifying that the device pointer was valid.

Additionally, the implementation utilized an in_dev_for_each_ifa_rcu
loop to match the packet source address against local interface
addresses. It assumed that packets from the same subnet should not see a
decrement on the initial TTL. A packet might appear it is from the same
subnet but it actually isn't especially in modern environments with
containers and virtual switching.

Remove the device dereference and interface loop. Replace the logic with
a switch statement that evaluates the TTL according to the ttl_check.

https://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16

https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114

https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293

https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b

https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8

https://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4

https://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277

https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782

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