CVE-2026-90013 Linux CVE debrief

Who should care

Linux kernel developers and administrators responsible for managing Linux systems with tracing enabled should assess exposure and prioritize updates or mitigations. Affected systems and versions need to be identified, and updates or mitigations should be prioritized.

Why it matters

A use-after-free vulnerability in the Linux kernel's tracing subsystem requires attention from Linux kernel developers and administrators. The vulnerability can cause kernel crashes and potentially lead to system instability or denial of service. Affected systems and versions need to be identified, and updates or mitigations should be prioritized.

• Potential kernel crashes due to use-after-free conditions.
• Need for verification of affected kernel versions and configurations.
• Importance of proper instance management to prevent exploitation.
• Potential for system instability or denial of service.

Technical summary

The Linux kernel's tracing subsystem has a use-after-free vulnerability. When opening options files, the trace_array reference is not taken, which can cause a kernel crash if the instance is removed while the file is open. A new helper function, trace_array_options_get(), has been created to handle this issue. The vulnerability affects Linux kernel developers and administrators responsible for managing Linux systems with tracing enabled. The vulnerability can cause kernel crashes and potentially lead to system instability or denial of service.

Defensive priority

High

Recommended defensive actions

• Review Linux kernel tracing configurations and ensure instances are properly managed to prevent use-after-free conditions.
• Verify system logs for potential exploitation attempts.
• Apply kernel updates when available.
• 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 NVD entry provide details on the vulnerability, but the scope of affected systems and versions is not explicitly stated. The Linux kernel's tracing subsystem is impacted, but specific version information is not provided in the source corpus.

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.