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

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

This patch restricts setting Loose Source and Record Route (LSRR)
and Strict Source and Record Route (SSRR) IP options to users
with CAP_NET_RAW capability.

This prevents unprivileged applications from forcing packets to route
through attacker-controlled nodes to leak TCP ISN and possibly other
protocol information.

While LSRR and SSRR are commonly filtered in many network environments,
they may still be supported and forwarded along some network paths.

RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing
IPv4 Options) recommend to drop these options in 4.3 and 4.4.

https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578

https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7

https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691

https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2

https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278

https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d

https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1

https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c

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