CVE-2026-64276 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and apply patches as necessary to prevent potential exploitation. This includes verifying Linux kernel versions, monitoring system logs for potential exploitation attempts, and reviewing compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

The Linux kernel vulnerability CVE-2026-64276 allows for local privilege escalation and potential system instability. Linux kernel developers, maintainers, and users should assess exposure and apply patches as necessary.

• Local privilege escalation is possible if the vulnerability is exploited.
• System crashes or instability may occur if the vulnerability is exploited.
• Data integrity may be compromised if the vulnerability is exploited.
• Verification of Linux kernel versions and patch application is necessary.

Technical summary

The synaptics-rmi4 driver in the Linux kernel did not properly bound the F30 keymap to the GPIO/LED count, leading to an out-of-bounds read and write vulnerability. An attacker with local access could potentially exploit this issue to escalate privileges or cause system instability. The vulnerability is caused by the keymap being sized incorrectly based on the GPIO/LED count. This issue has been resolved by sizing the keymap to the full gpioled_count. Linux kernel developers, maintainers, and users should assess exposure and apply patches as necessary to prevent potential exploitation.

Defensive priority

High

Recommended defensive actions

• Review and apply patches for the affected Linux kernel versions.
• Verify the Linux kernel version and update if necessary.
• Monitor system logs for potential exploitation attempts.
• 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.
• 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.

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its description, CVSS score, and affected versions. Multiple patch references are provided, indicating that the issue has been resolved in various kernel versions.

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.