NuytsTech Security

CVE-2025-40133

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

mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().

mptcp_active_enable() is called from subflow_finish_connect(),
which is icsk->icsk_af_ops->sk_rx_dst_set() and it’s not always
under RCU.

Using sk_dst_get(sk)->dev could trigger UAF.

Let’s use __sk_dst_get() and dst_dev_rcu().

More information : https://git.kernel.org/stable/c/893c49a78d9f85e4b8081b908fb7c407d018106a

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