In the Linux kernel, the following vulnerability has been resolved: mptcp: fix race in mptcppmnlflushaddrsdoit() syzbot and Eulgyu Kim reported crashes in mptcppmnlgetlocalid() and/or mptcppmnlisbackup() Root cause is listspliceinit() in mptcppmnlflushaddrsdoit() which is not RCU ready. listspliceinitrcu() can not be called here while holding pernet->lock spinlock. Many thanks to Eulgyu Kim for providing a repro and testing our patches.