CVE-2026-98767 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems should assess exposure and verify kernel versions. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review system configurations, conduct regular vulnerability assessments, and update incident response plans to include IRQ storm events. Prompt action is recommended to mitigate potential kernel panic.

Why it matters

A Linux kernel vulnerability can cause an IRQ storm, potentially leading to a kernel panic. Defenders should verify kernel versions and monitor system logs.

• Potential kernel panic due to IRQ storm
• Need to verify Linux kernel versions for patching
• Monitor system logs for IRQ storm events

Technical summary

The Linux kernel vulnerability causes an IRQ storm when a DWC3 gadget event buffer count is set to an invalid value. This can lead to a kernel panic with a call stack indicating a BUG at kernel/irq/spurious.c:184. The vulnerability is caused by a faulty event buffer count check, which can be triggered by writing a bogus value exceeding the event buffer length directly to the GEVNTCOUNT register. To address this, defenders should verify their Linux kernel versions and check for available patches. The vulnerability has been resolved in the Linux kernel, and patches are available.

Defensive priority

Medium

Recommended defensive actions

• Verify Linux kernel versions and check for available patches
• Monitor system logs for IRQ storm events
• Implement compensating controls to mitigate potential kernel panic
• Review system configurations for potential vulnerabilities
• Conduct regular vulnerability assessments
• Update incident response plans to include IRQ storm events
• Track changes to Linux kernel versions and patches

Evidence notes

The CVE record and source references indicate a Linux kernel vulnerability that can cause an IRQ storm. However, details on affected versions and exploitation are limited. Defenders should verify Linux kernel versions, check for available patches, and monitor system logs for IRQ storm events. The vulnerability has been resolved in the Linux kernel, and patches are available. However, without specific information on affected versions, defenders must take a cautious approach.

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.