In the Linux kernel, the following vulnerability has been resolved:
netfilter: nftables: Fix potential data-race in _nftflowtabletype_get()
nftunregisterflowtabletype() within nfflowinetmoduleexit() can concurrent with _nftflowtabletypeget() within nftablesnewflowtable(). And thhere is not any protection when iterate over nftablesflowtables list in _nftflowtabletypeget(). Therefore, there is pertential data-race of nftables_flowtables list entry.
Use listforeachentryrcu() to iterate over nftablesflowtables list in _nftflowtabletypeget(), and use rcureadlock() in the caller nftflowtabletype_get() to protect the entire type query process.
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