CVE-2026-98860 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, particularly those managing systems utilizing HID: bpf functionality, should assess exposure and prioritize patching. This includes reviewing system configurations, monitoring system logs for potential issues, and verifying the Linux kernel version. Security teams and vulnerability management teams should also be aware of this vulnerability and its potential impact on their systems.

Why it matters

A vulnerability in the Linux kernel's HID: bpf component can cause a hardware error to be silently converted into a success return value, potentially leaving BPF programs operating on uninitialized or stale data. Defenders should prioritize verifying the Linux kernel version and applying patches to address this vulnerability.

• Verification of Linux kernel version and patch application is required to prevent potential issues
• Defenders should review system configurations for HID: bpf usage to determine exposure
• Monitoring system logs for potential issues related to this vulnerability is recommended

Technical summary

The Linux kernel's HID: bpf component has a vulnerability where a hardware error can be silently converted into a success return value, potentially leaving BPF programs operating on uninitialized or stale data. This issue is resolved by casting size to ssize_t when checking hid_bpf_hw_request. The vulnerability arises from a type promotion issue when comparing a negative error code against size, leading to incorrect handling of hardware errors. Defenders should prioritize patching and review system configurations for HID: bpf usage.

Defensive priority

Defenders should prioritize verifying the Linux kernel version and applying patches to address this vulnerability, particularly for systems utilizing HID: bpf functionality.

Recommended defensive actions

• Verify Linux kernel version and apply patches
• Review system configurations for HID: bpf usage
• Monitor system logs for potential issues
• Perform vulnerability assessment
• Implement compensating controls
• Track exceptions and retest remediated assets
• Review change management processes

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the CVSS score and severity are not provided. The vulnerability is resolved by casting size into ssize_t when checking hid_bpf_hw_request. Defenders should verify the Linux kernel version and apply patches to address this vulnerability.

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.