CVE-2024-44974 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mptcp: pm: avoid possible UaF when selecting endp

select_local_address() and select_signal_address() both select an endpoint entry from the list inside an RCU protected section but return a reference to it to be read later on. If the entry is dereferenced after the RCU unlock reading info could cause a Use-after-Free.

A simple solution is to copy the required info while inside the RCU protected section to avoid any risk of UaF later. The address ID might need to be modified later to handle the ID0 case later so a copy seems OK to deal with.

Reference

https://git.kernel.org/stable/c/9a9afbbc3fbfca4975eea4aa5b18556db5a0c0b8 https://git.kernel.org/stable/c/0201d65d9806d287a00e0ba96f0321835631f63f https://git.kernel.org/stable/c/48e50dcbcbaaf713d82bf2da5c16aeced94ad07d