CVE-2026-63858netfilter: nf_tables: add hook transactions for device deletions

Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: add hook transactions for device deletions Restore the flag that indicates that the hook is going away, ie. NFT_HOOK_REMOVE, but add a new transaction object to track deletion of hooks without altering the basechain/flowtable hook_list during the preparation phase. The existing approach that moves the hook from the basechain/flowtable hook_list to transaction hook_list breaks netlink dump path readers of this RCU-protected list. It should be possible use an array for nft_trans_hook to store the deleted hooks to compact the representation but I am not expecting many hook object, specially now that wildcard support for devices is in place. Note that the nft_trans_chain_hooks() list contains a list of struct nft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while this list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE. Note that new commands can be updated to use nft_trans_hook for consistency. This patch also adapts the event notification path to deal with the list of hook transactions.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/768daa9f4276be4007e88dea61a378c8582ba008
• https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c
• https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091