CVE-2024-35898

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.