In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: Fix potential data-race in _nftexprtypeget() nftunregisterexpr() can concurrent with _nftexprtypeget(), and there is not any protection when iterate over nftablesexpressions list in _nftexprtypeget(). Therefore, there is potential data-race of nftablesexpressions list entry. Use listforeachentryrcu() to iterate over nftablesexpressions list in _nftexprtypeget(), and use rcureadlock() in the caller nftexprtypeget() to protect the entire type query process.