In the Linux kernel, the following vulnerability has been resolved: nfsd: fix legacy client tracking initialization Get rid of the nfsd4_legacy_tracking_ops->init() call in check_for_legacy_methods(). That will be handled in the caller (nfsd4_client_tracking_init()). Otherwise, we'll wind up calling nfsd4_legacy_tracking_ops->init() twice, and the second time we'll trigger the BUG_ON() in nfsd4_init_recdir().
https://git.kernel.org/stable/c/de71d4e211eddb670b285a0ea477a299601ce1ca
https://git.kernel.org/stable/c/cdd66082b227eb695cbf54b7c121ea032e869981
https://git.kernel.org/stable/c/95407304253a4bf03494d921c6913e220c26cc63