CVE-2026-90124 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, system administrators responsible for Linux kernel updates, and users of Linux-based systems that utilize the irqchip/renesas-rzg2l driver should assess exposure and apply patches to prevent potential issues. They should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

This vulnerability in the Linux kernel's irqchip/renesas-rzg2l driver may cause interrupt loss, potentially leading to system instability and delayed event handling. Linux kernel developers, maintainers, and system administrators should assess exposure and apply patches to prevent potential issues.

• Potential loss of interrupts may lead to system instability
• Interrupt loss may cause delayed or missed event handling
• System administrators may need to investigate and apply patches

Technical summary

The irqchip/renesas-rzg2l driver in the Linux kernel improperly handles interrupt status registers, leading to potential interrupt loss when multiple interrupts occur concurrently. This issue is addressed in various Linux kernel patches. Developers and maintainers should review and apply these patches to prevent potential issues. The vulnerability can be reproduced by triggering multiple interrupts at once, and it may cause system instability and delayed event handling. Linux kernel developers, maintainers, and system administrators should assess exposure and apply patches.

Defensive priority

Medium

Recommended defensive actions

• Review and apply patches from Linux kernel maintainers
• Update Linux kernel to a version that includes the fix
• Monitor system logs for potential interrupt loss issues
• 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 references to patches. However, there is limited information on potential exploits or attacks. Defenders should verify the affected scope, severity, and vendor guidance. They should also review compensating controls for exposed systems while remediation is scheduled and verified.

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.