CVE-2026-74565 Linux CVE debrief

Who should care

Linux administrators, security teams, and developers working with the Linux kernel should assess exposure and prioritize verification of affected systems. They should review Linux kernel configurations and versions to determine exposure, verify nft_object rhltable settings, and consider updates to prevent potential security risks.

Why it matters

A use-after-free vulnerability in the Linux kernel's netfilter component requires attention from Linux administrators and security teams to assess exposure and prioritize verification of affected systems.

• Potential security risks due to use-after-free vulnerability
• Need for verification of affected Linux kernel versions
• Importance of monitoring system logs for suspicious activity

Technical summary

The Linux kernel's netfilter component has a use-after-free vulnerability due to a global nft_object rhltable. This allows for accessing objects being released, potentially leading to security issues. The fix involves making the rhltable per table to address the issue. Linux administrators and security teams should assess exposure and prioritize verification of affected systems to prevent potential security risks. The vulnerability requires attention to assess exposure and prioritize verification of affected systems.

Defensive priority

Linux administrators and security teams should assess exposure and prioritize verification of affected systems.

Recommended defensive actions

• Review Linux kernel configurations and versions to determine exposure
• Verify nft_object rhltable settings and consider updates
• Monitor system logs for suspicious netfilter activity
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and affected components. The Linux kernel's netfilter component has a use-after-free vulnerability due to a global nft_object rhltable. This allows for accessing objects being released, potentially leading to security issues. The fix involves making the rhltable per table. Linux administrators and security teams should assess exposure and prioritize verification of affected systems.

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.