CVE-2026-64424 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux kernel versions that are vulnerable should assess exposure and apply patches to prevent potential use-after-free errors. Linux kernel maintainers and users should review Linux kernel versions and update to patched versions. Linux kernel maintainers and users should monitor Linux kernel updates and apply patches as needed.

Why it matters

A use-after-free vulnerability in the Linux kernel's netpoll component has been addressed. Linux kernel maintainers and users should assess exposure and apply patches to prevent potential use-after-free errors.

• Verify Linux kernel versions to determine exposure
• Apply patches to prevent potential use-after-free errors
• Monitor Linux kernel updates and apply patches as needed

Technical summary

The Linux kernel's netpoll component has a use-after-free vulnerability. The problem arises when a pending TX worker runs in parallel with the cleanup path, leading to a potential use-after-free error. This has been resolved through the use of disable_delayed_work_sync() to ensure the worker is completely stopped and prevent any future re-arming attempts. The vulnerability was detected by KASAN and involves a use-after-free error in the netpoll component of the Linux kernel. Linux kernel maintainers and users should assess exposure and apply patches to prevent potential use-after-free errors.

Defensive priority

Linux kernel maintainers and users should assess exposure and apply patches to prevent potential use-after-free errors.

Recommended defensive actions

• Assess exposure and apply patches to prevent potential use-after-free errors
• Review Linux kernel versions and update to patched versions
• Monitor Linux kernel updates and apply patches as needed
• Verify Linux kernel versions to determine exposure
• Apply patches to prevent potential use-after-free errors
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability was detected by KASAN and involves a use-after-free error in the netpoll component of the Linux kernel. The problem occurs when a pending TX worker runs in parallel with the cleanup path.

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.