CVE-2026-97960 Linux CVE debrief

Who should care

Linux kernel administrators, security teams, and developers working with perf/x86/intel events should assess exposure and prioritize verification of affected systems, review supplied official advisories, and plan vendor-supported updates or mitigations. They should also verify affected scope, severity, and vendor guidance, and check relevant monitoring, detection, and logs for exposed assets that need extra review.

Why it matters

CVE-2026-97960 is a vulnerability in the Linux kernel's perf/x86/intel component that requires verification of affected systems and potential patching or updating of Linux kernel versions.

• Verification of affected Linux kernel systems is required to determine exposure
• Potential for stale buffer state and out-of-bound memory access if drain_pebs() is reentered
• Patching or updating Linux kernel versions may be necessary to address the vulnerability

Technical summary

The Linux kernel's perf/x86/intel component has a vulnerability that allows reentry into the drain_pebs() function, potentially leading to stale buffer state and out-of-bound memory access. This issue arises because the PEBS buffer is shared among all events on a CPU and drain_pebs() is reachable from process context via intel_pmu_drain_pebs_buffer(). To address this, __intel_pmu_quiesce() and __intel_pmu_resume() helpers have been introduced to disable the full PMU around the intel_pmu_drain_pebs_buffer() call, preventing reentry. A warning has also been added in intel_pmu_drain_pebs_buffer() when the full PMU is not disabled.

Defensive priority

Linux kernel administrators and security teams should assess exposure and prioritize verification of affected systems, especially those with active perf/x86/intel events.

Recommended defensive actions

• Assess exposure of Linux kernel systems with active perf/x86/intel events
• Verify if systems are using affected kernel versions
• Apply patches or updates provided by the Linux kernel maintainers
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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 CVE record and source references provide details on the vulnerability and its resolution in the Linux kernel. However, specific version information and exploitation details are not provided. Linux kernel administrators and security teams should verify affected systems, review supplied official advisories, and plan vendor-supported updates or mitigations. They should also check relevant monitoring, detection, and logs for exposed assets that need extra review.

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.