CVE-2026-74471 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, users of Linux-based systems, and security teams responsible for vulnerability management and patch deployment should be aware of this vulnerability and take necessary actions to mitigate it. This includes reviewing and applying patches, monitoring system updates, and implementing compensating controls where necessary. Additionally, operators of Linux-based systems should assess their exposure and prioritize patching based on their specific environments and risk profiles. Security teams should also track exceptions, retest remediated assets, and ensure that evidence of remediation is properly documented. This vulnerability affects various Linux kernel versions and has significant implications for system security and stability, making it essential for affected parties to address promptly and thoroughly. The vulnerability's impact on system performance and potential for exploitation require immediate attention from Linux kernel developers, maintainers, and users alike to prevent potential misuse. Therefore, it is crucial for Linux kernel developers and maintainers to prioritize patching and for Linux distribution vendors to provide timely updates to their customers. Users of Linux-based systems must also take proactive measures to protect their environments, such as monitoring system logs and implementing additional security controls. Overall, a coordinated effort is necessary to mitigate the risks associated with this vulnerability and ensure the security and integrity of Linux-based systems. Linux kernel developers and maintainers should also consider providing guidance on patch deployment and mitigation strategies to help users address this vulnerability effectively. Furthermore, Linux distribution vendors and users of Linux-based systems should stay informed about updates and patches related to this vulnerability and take prompt action to protect their systems. By working together, the Linux community can minimize the impact of this vulnerability and maintain the security and stability of Linux-based systems. Linux kernel developers and maintainers, Linux distribution vendors, and users of (

Technical summary

The Linux kernel has a vulnerability in the tracing subsystem. The trace_module_add_events() function ignores the return value of __register_event() and unconditionally calls __add_event_to_tracers() for each event. If __register_event() fails, the trace_event_call is not added to ftrace_events list, but __add_event_to_tracers() still creates a trace_event_file pointing to it. This can lead to a use-after-free when tracefs or tracing subsystem operations are later executed.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided patches to fix the vulnerability
• Monitor Linux kernel updates for potential fixes
• Consider implementing compensating controls to mitigate the vulnerability
• Perform a thorough review of system logs to detect potential exploitation attempts
• Conduct an asset inventory to identify all systems that may be affected by this vulnerability
• Implement additional security controls to mitigate the vulnerability
• Track exceptions and retest remediated assets to ensure the vulnerability is properly addressed

Evidence notes

The vulnerability exists in the Linux kernel's tracing subsystem. The trace_module_add_events() function does not check the return value of __register_event(). If __register_event() fails, it can lead to a use-after-free vulnerability.

Official resources