CVE-2026-89620 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel systems using HID devices should assess exposure and prioritize patching. This includes operators managing Linux kernel systems, vulnerability management teams, and security teams responsible for HID device configurations. They should verify and apply patches, review system configurations, and monitor system logs for potential exploitation attempts.

Why it matters

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly for systems using HID devices, as it can lead to a buffer overflow if exploited.

• Verify and apply patches to prevent potential buffer overflow
• Monitor system logs for exploitation attempts
• Review system configurations for HID devices

Technical summary

The `write_cmd_to_txdma` function in the Linux kernel's HID: intel-thc-hid: intel-quickspi does not validate report size before copying it into a heap buffer. This can lead to a buffer overflow if a HID raw SET_REPORT/SET_FEATURE ioctl carries a report larger than the device-descriptor-derived max_report_len. The vulnerability has been resolved with a patch that validates report size before copying. Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly for systems using HID devices.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly for systems using HID devices.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this vulnerability
• Review system configurations for HID devices and ensure they are properly secured
• Monitor system logs for potential exploitation attempts
• Perform vulnerability scans to identify exposed systems
• Implement compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Review asset inventory for affected products

Evidence notes

The CVE record and source references indicate a buffer overflow vulnerability in the Linux kernel's HID: intel-thc-hid: intel-quickspi. The vulnerability has been resolved with a patch that validates report size before copying.

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.