CVE-2026-89729 Linux CVE debrief

Who should care

Linux kernel developers, maintainers, and users who rely on HID sensor hub features should assess their exposure and verify the integrity of their kernel versions and HID descriptors.

Why it matters

This vulnerability allows for an out-of-bounds write in the Linux kernel's sensor_hub_get_feature function, potentially leading to buffer overflows and system instability. Linux kernel developers, maintainers, and users should assess their exposure and verify the integrity of their kernel versions and HID descriptors.

• Verify kernel version integrity to prevent potential buffer overflows.
• Implement additional monitoring to detect malicious HID descriptor inputs.
• Update to fixed kernel versions to prevent exploitation.

Technical summary

The sensor_hub_get_feature function in the Linux kernel does not properly clamp its return value to the caller's buffer size, allowing for an out-of-bounds write. A malicious HID descriptor can trigger this issue by advertising a large feature field size while an IIO caller supplies a small stack buffer. This vulnerability can be mitigated by reviewing and updating Linux kernel versions, implementing additional monitoring, and verifying HID descriptor integrity. HID core stores parsed report values in __s32 slots and clamps extracted values to 32 bits. Reject feature fields that require more than one slot per value, guard the total byte count calculation, and clamp each per-value copy to the remaining caller  

Defensive priority

High

Recommended defensive actions

• Review and update Linux kernel versions to ensure they are not affected by this vulnerability.
• Implement additional monitoring and logging to detect potential exploitation attempts.
• Verify the integrity of HID descriptors and sensor hub features to prevent malicious inputs.
• Perform a thorough review of system logs to identify any suspicious activity.
• Conduct a comprehensive asset inventory to identify potentially affected systems.
• Establish a rollback plan for changes made to address this vulnerability.
• Track and document exceptions during the remediation process.

Evidence notes

The CVE record and source item provide details about the vulnerability, including its description and affected versions. However, the corpus does not establish specific exploitation instances or remediation steps beyond updating to fixed 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.