CVE-2026-64583 Linux CVE debrief

Who should care

Users of the Linux kernel, particularly those using the Broadcom BDC UDC driver, should be aware of this vulnerability and ensure their systems are updated with the latest kernel version. This includes Linux kernel developers, maintainers, and users who rely on the Broadcom BDC UDC driver for their systems. Additionally, security teams and vulnerability management teams should be aware of this issue and take steps to mitigate potential risks. Operators and administrators of affected systems should also be aware of this vulnerability and take steps to ensure their systems are updated and secure. Furthermore, platform and security teams should review their configurations and ensure that the updated kernel is properly deployed and configured to prevent potential security issues. IT teams and asset managers should also be aware of this issue and ensure that their systems are updated and secure. Lastly, anyone responsible for maintaining or securing Linux-based systems that utilize the Broadcom BDC UDC driver should take note of this vulnerability and take appropriate action to protect their systems. This may involve reviewing system configurations, monitoring system logs, and ensuring that the updated kernel is properly deployed and configured to prevent potential security issues. By taking these steps, users can help prevent potential security risks and ensure the stability and security of their systems. The vulnerability affects Linux kernel versions prior to the patched version, and users should ensure they are running the latest version to mitigate potential risks. The fix is relatively straightforward and involves updating the IRQ handling mechanism to prevent use-after-free and NULL-deref issues. Overall, users of the Linux kernel and administrators of affected systems should take note of this vulnerability and take steps to ensure their systems are updated and secure. This may involve working with Linux kernel developers, maintainers, and security teams to ensure that the updated kernel is properly deployed and configured to prevent potential security issues. By doing so, users can help prevent potential security risks and ensure the stability and security of

Technical summary

The Broadcom BDC UDC driver had a vulnerability where the IRQ handler remained deliverable after bdc_remove() returned, causing potential NULL-deref or use-after-free. The fix involves replacing devm_request_irq() with request_irq() and adding an explicit free_irq() in bdc_remove(). This change ensures that the IRQ handler is properly cleaned up after the device is removed, preventing potential crashes or security issues. The vulnerability was found by an in-house static analysis tool.

Defensive priority

This vulnerability has been resolved in the Linux kernel. Users should ensure their systems are updated with the latest kernel version to mitigate potential risks.

Recommended defensive actions

• Update Linux kernel to the latest version to ensure the fix is applied.
• Review system configurations to ensure the updated kernel is properly deployed.
• Monitor system logs for any potential issues related to the BDC UDC driver.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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.

Evidence notes

The issue was found by an in-house static analysis tool. The Broadcom BDC UDC driver had a vulnerability where the IRQ handler remained deliverable after bdc_remove() returned, causing potential NULL-deref or use-after-free. The fix involves replacing devm_request_irq() with request_irq() and adding an explicit free_irq() in bdc_remove().

Official resources