Linux kernel 5.15.43 has been released to update Multipath TCP.

Linux kernel 5.15.43 released

Linux kernel version 5.15.43 is now available:

Full source:   https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.43.tar.xz
Patch:   https://cdn.kernel.org/pub/linux/kernel/v5.x/patch-5.15.43.xz
PGP Signature:   https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.43.tar.sign

You can view the summary of the changes at the following URL:
  https://git.kernel.org/stable/ds/v5.15.43/v5.15.42