Local Lock Release Before Softirq Re-enable in Linux Kernel

Executive Summary

This vulnerability in the Linux kernel involves an incorrect order of operations in the error path of the netfilter subsystem. Specifically, local_bh_enable() is called before local_unlock_nested_bh(), which could lead to improper handling of softirqs and potential race conditions.

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Detection Guidance

This vulnerability is specific to the Linux kernel's netfilter subsystem and involves incorrect handling of local locks and softirqs in the nft_inner module. Detection requires checking kernel logs for related errors or kernel crashes involving netfilter or nftables. Commands like dmesg | grep -i nft or journalctl -k | grep -i nft may help identify issues. Ensure your kernel is updated to a patched version.

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Impact Analysis

This vulnerability may cause system instability, crashes, or unexpected behavior due to improper softirq handling. It could lead to denial-of-service conditions or security issues if exploited to manipulate kernel behavior.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel issue related to local_lock and softirq handling. No evidence suggests it impacts data protection, privacy, or security controls required by these regulations.

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Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the nft_inner local_lock and softirq handling issue.

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