CVE-2026-97935 Linux CVE debrief

Who should care

Linux kernel developers, maintainers, Linux distribution vendors, and users of Linux-based systems should assess exposure and verify remediation. They should review and update Linux kernel versions, monitor system logs, and implement additional security controls to prevent exploitation. Linux kernel developers and maintainers should prioritize patch application and verification. Linux distribution vendors should provide updated packages and guidance to A

Why it matters

A use-after-free vulnerability in the Linux kernel's tracing subsystem requires attention from Linux kernel developers, maintainers, and users. The vulnerability can lead to system crashes, potential elevation of privileges, and requires verification of patch application and additional monitoring.

• Potential system crashes or instability due to use-after-free errors
• Possible elevation of privileges or unauthorized access
• Required verification of Linux kernel versions and patch application
• Need for additional monitoring and logging to detect potential exploitation attempts

Technical summary

The Linux kernel's tracing subsystem has a use-after-free vulnerability. When registering a histogram trigger with an invalid clock string, the trigger is added to the global list before clock validation. If validation fails, the trigger is not removed, leading to potential use-after-free errors. This vulnerability requires attention from Linux kernel developers, maintainers, and users. It can lead to system crashes and potential elevation of privileges. The issue arises from a flawed registration process for histogram triggers in the Linux kernel's tracing subsystem.

Defensive priority

Medium

Recommended defensive actions

• Review and update Linux kernel versions to ensure the fix is applied
• Monitor system logs for potential exploitation attempts
• Implement additional security controls to prevent exploitation
• Verify Linux kernel versions and patch application
• Track exceptions and retest remediated assets
• Check relevant monitoring and detection logs
• Review compensating controls for exposed systems

Evidence notes

The vulnerability was introduced due to a flawed registration process for histogram triggers in the Linux kernel's tracing subsystem. The trigger is registered before the clock string is validated, leading to a potential use-after-free error if validation fails.

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.