CVE-2026-80604 Linux CVE debrief

Who should care

Linux kernel users and administrators, especially those with systems relying on HID functionality, should be aware of this vulnerability. They should identify affected product deployments, review official advisories, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Compensating controls for exposed systems should be reviewed while remediation is scheduled and verified. Relevant monitoring, detection, and logs for exposed assets should be checked for extra review. Exceptions, retested remediated assets, and closed items should be tracked only after evidence is documented. Security teams and vulnerability management teams should prioritize patching to prevent potential OOB reads and monitor system logs for potential exploitation attempts. System administrators and operators should also be aware of the vulnerability and take necessary precautions to prevent exploitation. Additionally, asset inventory and rollback/change windows should be reviewed to ensure that affected systems are properly managed and updated. Source tracking and exposure review should also be performed to ensure that all necessary steps are taken to mitigate the vulnerability. Monitoring and compensating controls should be implemented to detect and prevent potential exploitation attempts. Overall, a comprehensive review of affected systems and implementation of necessary controls is crucial to prevent exploitation of this vulnerability. The CVE-2026-80604 vulnerability affects Linux kernel users and administrators who rely on HID functionality, and they should take necessary precautions to prevent exploitation. The vulnerability can be mitigated by applying patches, restricting access to vulnerable kernel functionality, and monitoring system logs for potential exploitation attempts. A thorough review of affected systems and implementation of necessary controls is essential to prevent exploitation of this vulnerability. Linux kernel users and administrators should prioritize patching to prevent potential OOB reads and monitor system logs for potential exploitation attempts. They should also review compensating controls for exposed systems,

Technical summary

The CVE-2026-80604 vulnerability in the Linux kernel's HID core allows for an out-of-bounds read when a caller passes a size of 0 to hid_report_raw_event() for a numbered report. This results in an unvalidated call to hid_get_report(), which can cause a kernel panic. The issue is resolved by moving the numbered report size validation check before the call to hid_get_report(). This change ensures that the report size is at least 1 before dereferencing the data pointer, preventing the out-of-bounds read.

Defensive priority

Linux kernel users should prioritize patching to prevent potential OOB reads.

Recommended defensive actions

• Apply patches to the Linux kernel to fix the HID core vulnerability
• Restrict access to vulnerable kernel functionality
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems
• 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.

Evidence notes

The CVE-2026-80604 vulnerability in the Linux kernel's HID core allows for an out-of-bounds read when a caller passes a size of 0 to hid_report_raw_event() for a numbered report. This results in an unvalidated call to hid_get_report(), which can cause a kernel panic. Official CVE and NVD records provide details, but affected scope and vendor remediation status are unclear.

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.