CVE-2026-97526 Linux CVE debrief

Who should care

Linux system administrators and users who run 'perf stat' commands or have dynamic CPU allocation in their environments should be aware of this vulnerability and take steps to mitigate it.

Why it matters

CVE-2026-97526 is a Linux kernel vulnerability that allows a kernel panic when CPUs are hot-added during a 'perf stat' run. The vulnerability is caused by missing per-CPU data structures for newly added CPUs, which are dynamically allocated when an event with task context is created. This allocation is insufficient for handling CPU hotplug events. Linux system administrators and users who run 'perf stat' commands or have dynamic CPU allocation in their environments should be aware of this vulnerability and take steps to mitigate it.

• Denial-of-service condition due to kernel panic
• Potential for system instability or crashes
• Need for additional monitoring and logging to detect potential attacks

Technical summary

The Linux kernel vulnerability CVE-2026-97526 is caused by the dynamic allocation of per-CPU data structures when an event with task context is created. This allocation is insufficient for handling CPU hotplug events, leading to a kernel panic when CPUs are hot-added during a 'perf stat' run. The vulnerability can be mitigated by applying kernel updates and monitoring system logs for signs of kernel panics or other unusual activity.

Defensive priority

Medium

Recommended defensive actions

• Review and apply kernel updates to ensure the latest security patches are installed.
• Monitor system logs for signs of kernel panics or other unusual activity.
• Consider implementing additional security measures, such as restricting access to perf stat and other sensitive commands.
• Perform a thorough review of system configurations and CPU allocation to identify potential vulnerabilities.
• Implement monitoring tools to detect and alert on unusual system activity.
• Conduct regular security audits to ensure compliance with best practices.
• Review and update incident response plans to address potential denial-of-service conditions.

Evidence notes

The CVE record and associated source references provide details on the vulnerability, including its cause and potential impact. However, there is limited information on the exploitability of the vulnerability and the existence of any patches or mitigations.

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.