CVE-2026-64587 Linux CVE debrief

Who should care

Linux kernel users and administrators, Linux distribution maintainers, Cloud service providers using Linux, Security teams managing Linux systems, IT teams responsible for patch management and system updates, Developers working with Linux kernel modules, System administrators responsible for network configurations and monitoring, Vulnerability management teams, Penetration testers and security researchers focusing on Linux systems, Linux community and forums discussing kernel security and updates, and Linux-based embedded system developers and users.

Technical summary

The Linux kernel vulnerability allows for potential interrupt delivery issues during probe teardown. To address this, the device should be put into a quiescent state before requesting the IRQ. This change keeps the hardware-focused and minimal, while preventing spurious IRQ delivery from leftover state. The vulnerability has been resolved in the Linux kernel. Users should ensure they have the latest kernel patches installed. The fix involves disabling all EMAC interrupt sources and clearing any pending EMAC interrupt status bits. This prevents race conditions between interrupt delivery and net_device release. The change is hardware-focused, minimal, and effective in preventing spurious IRQ delivery from leftover state.

Defensive priority

Linux kernel users should verify their systems are updated with the latest patches and review network configurations.

Recommended defensive actions

• Verify system is updated with latest Linux kernel patches
• Review network configurations for potential issues
• Monitor system logs for suspicious activity
• Perform vulnerability assessment to identify potential exposure
• Implement compensating controls for exposed systems
• Conduct asset inventory to identify affected systems
• Track changes to Linux kernel configurations

Evidence notes

The Linux kernel vulnerability allows for potential interrupt delivery issues during probe teardown. To address this, the device should be put into a quiescent state before requesting the IRQ. Linux kernel users should verify their systems are updated with the latest patches and review network configurations. The vulnerability has been resolved in the Linux kernel. Users should ensure they have the latest kernel patches installed.

Official resources