CVE-2026-46324 Linux CVE debrief

Who should care

Linux kernel maintainers and users, particularly those using affected versions, should review and apply patches to mitigate the vulnerability. Linux kernel users should monitor updates and patches for potential vulnerabilities. Maintainers should review and apply patches to ensure system stability and security.

Why it matters

The CVE-2026-46324 vulnerability in the Linux kernel's netfilter: nf_tables requires patching to prevent potential system crashes or code execution. Linux kernel maintainers and users should prioritize patching and monitoring updates to ensure system stability and security.

• Defenders should prioritize patching to prevent potential crashes or code execution.
• Linux kernel users should monitor updates and patches for potential vulnerabilities.
• Maintainers should review and apply patches to ensure system stability and security.

Technical summary

The Linux kernel's netfilter: nf_tables has a vulnerability related to the use of list_del_rcu for netlink hooks. nft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks need to use list_del_rcu(), as this list can be walked by concurrent dumpers. A new helper has been added and is used consistently to address this issue. Linux kernel maintainers and users should review and apply patches to mitigate the vulnerability, ensuring system stability and security. The patched versions should be verified and applied to prevent potential system crashes or code execution.

Defensive priority

Medium priority for Linux kernel maintainers and users to review and apply patches.

Recommended defensive actions

• Review and apply patches for the Linux kernel's netfilter: nf_tables vulnerability.
• Update to the latest Linux kernel version that includes the fix.
• Monitor Linux kernel updates and patches for potential vulnerabilities.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, there is limited information on potential exploits or attacks. Linux kernel maintainers and users should verify the patched versions and ensure they are applied to prevent potential system crashes or code execution. The vulnerability is resolved in the Linux kernel's netfilter: nf_tables with the use of list_del_rcu for netlink hooks.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.