CVE-2026-98000 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems. They should verify device and kernel versions, monitor system logs, and apply updates as necessary. The vulnerability can cause system crashes, code execution, or privilege escalation.

Why it matters

A use-after-free vulnerability in the Linux kernel's hwmon subsystem can lead to potential system crashes, code execution, or privilege escalation. Linux kernel developers, maintainers, and users should verify device and kernel versions, monitor system logs, and apply updates as necessary.

• Potential system crashes or instability
• Possible code execution or privilege escalation
• Verification of device and kernel versions required
• Monitoring system logs for potential use-after-free errors recommended

Technical summary

The Linux kernel's hwmon subsystem is vulnerable to a use-after-free condition. When pec_store() encounters an error, it attempts to unlock a mutex after freeing the associated device. This can lead to a potential crash or code execution. The vulnerability was introduced in the Linux kernel's hwmon subsystem, specifically in the pec_store() function. The patch notes and commit hashes are: 01dd8b4, 354ccc99, and 8afab57. Linux kernel developers, maintainers, and users should verify device and kernel versions, monitor system logs, and apply updates as necessary.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel patch notes and apply updates
• Monitor system logs for potential use-after-free errors
• Verify device and kernel versions
• 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 entry provide limited information about the vulnerability. The Linux kernel patch notes and commit hashes are provided as references. The vulnerability was introduced in the Linux kernel's hwmon subsystem, specifically in the pec_store() function. The patch notes and commit hashes are: 01dd8b4, 354ccc99, and 8afab57.

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.