CVE-2026-93275 Linux CVE debrief

Who should care

Linux administrators and developers using Intel PT events should assess exposure and verify system configurations to prevent potential WARNINGs and ensure system stability. This includes reviewing Linux kernel versions, applying patches as necessary, and monitoring system logs for potential WARNINGs related to Intel PT events.

Why it matters

Linux kernel vulnerability CVE-2026-93275 requires verification of Intel PT event handling and group throttling configurations to prevent potential WARNINGs and ensure system stability.

• Verify Intel PT event handling and group throttling configurations
• Monitor system logs for potential WARNINGs related to Intel PT events
• Apply patches to Linux kernel versions as necessary

Technical summary

The Linux kernel vulnerability, CVE-2026-93275, relates to Intel PT event handling. When `pt_event_stop()` is called without the `PERF_EF_UPDATE` flag, `perf_aux_output_end()` is not called. This can lead to nested `perf_aux_output_begin()` calls and a WARNING. The issue arises from group throttling introduced by a specific commit. Affected Linux kernel versions require verification of Intel PT event handling and group throttling configurations to prevent potential WARNINGs and ensure system stability. Linux administrators and developers should assess exposure and verify system configurations.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel versions and apply patches as necessary
• Monitor system logs for potential WARNINGs related to Intel PT events
• Verify group throttling configurations and Intel PT event handling
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the Linux kernel vulnerability and its resolution. The NVD entry is currently not provided. To verify, Linux administrators should check system configurations, review Intel PT event handling, and monitor system logs for potential WARNINGs related to Intel PT events. Evidence limits suggest focusing on official CVE Program records and supplemental source references for further information.

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.