CVE-2026-98528 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, system administrators, and users with access to Linux systems, especially those with untrusted user access, should assess exposure and prioritize verification of affected systems.

Why it matters

CVE-2026-98528 is a Linux kernel vulnerability that could allow kernel stack contents to be leaked to user-space in error paths within the GPIO character device. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with untrusted user access.

• Potential kernel stack data leak to user-space in error paths
• Need to verify Linux kernel versions and configurations for exposure
• Requires patching or updating Linux kernel to mitigate vulnerability

Technical summary

The Linux kernel vulnerability (CVE-2026-98528) occurs in the GPIO character device (gpio_cdev). If acquiring the GPIO chip guard fails in gpio_desc_to_lineinfo(), the function returns without zeroing the info struct passed to lineinfo_get_v1(). This could potentially leak kernel stack contents to user-space. The vulnerability has been resolved in the Linux kernel, and users are advised to review their kernel versions and configurations for exposure. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with untrusted user access.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with untrusted user access.

Recommended defensive actions

• Review Linux kernel versions and configurations for exposure to CVE-2026-98528
• Verify system access controls and user privileges to mitigate potential impact
• Apply patches or updates from Linux kernel maintainers as they become available
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the Linux kernel vulnerability. Four source references from the Linux kernel Git repository are provided, detailing code changes addressing the issue. The vulnerability has been resolved in the Linux kernel, and users are advised to review their kernel versions and configurations for exposure. The evidence is based on the official CVE Program record and NVD entry, which provide source-provided CVE metadata and vulnerability assessment.

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.