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Unrated severityNVD Advisory· Published Jul 29, 2024· Updated Nov 3, 2025

netfilter: nf_tables: prefer nft_chain_validate

CVE-2024-41042

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: prefer nft_chain_validate

nft_chain_validate already performs loop detection because a cycle will result in a call stack overflow (ctx->level >= NFT_JUMP_STACK_SIZE).

It also follows maps via ->validate callback in nft_lookup, so there appears no reason to iterate the maps again.

nf_tables_check_loops() and all its helper functions can be removed. This improves ruleset load time significantly, from 23s down to 12s.

This also fixes a crash bug. Old loop detection code can result in unbounded recursion:

BUG: TASK stack guard page was hit at .... Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN CPU: 4 PID: 1539 Comm: nft Not tainted 6.10.0-rc5+ #1 [..]

with a suitable ruleset during validation of register stores.

I can't see any actual reason to attempt to check for this from nft_validate_register_store(), at this point the transaction is still in progress, so we don't have a full picture of the rule graph.

For nf-next it might make sense to either remove it or make this depend on table->validate_state in case we could catch an error earlier (for improved error reporting to userspace).

Affected products

145

Patches

8
cff3bd012a95
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9df785aeb7dc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
717c91c6ed73
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
b6b6e430470e
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
8246b7466c8d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
1947e4c3346f
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
31c35f9f89ef
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
cd4348e0a502
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

0

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