CVE-2026-63858
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability was found in the Linux kernel's netfilter nf_tables subsystem, related to incorrect hook deletion during device removal. The previous approach moving hooks from the base list to the transaction list caused read issues on the RCU-protected list in the netlink dump path. The patch restores the NFT_HOOK_REMOVE flag and introduces a new transaction object to track hook deletions without altering the hook_list during the preparation phase.
Risk Assessment
The vulnerability may cause data inconsistency during device deletion operations in nftables firewall, potentially allowing an attacker to disrupt packet filtering rules or trigger a kernel panic.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing the fix (commit with the solution). Monitor official security advisories from your Linux distribution for the appropriate kernel package.
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Original NVD description (English source)
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.