CVE-2026-99001 Linux CVE debrief

Who should care

Linux kernel users and administrators who have updated to the affected versions should assess their exposure and verify if their systems are vulnerable. They should review and apply the provided patches to ensure the i2c client work is properly canceled on remove.

Why it matters

A use-after-free vulnerability in the Linux kernel's drm/xe/i2c component may lead to potential security issues if not properly patched. Linux kernel users and administrators should assess their exposure and take necessary actions to mitigate the vulnerability.

• Verify Linux kernel version and update to a fixed version if necessary.
• Review and apply patches to ensure i2c client work is properly canceled on remove.
• Monitor Linux kernel and drm/xe/i2c component for related security advisories or updates.

Technical summary

The Linux kernel's drm/xe/i2c component has a use-after-free vulnerability. The xe_i2c_notifier() function stores the DesignWare adapter in i2c->adapter and schedules i2c->work when the adapter is registered. However, xe_i2c_remove() tears down the AMC, unregisters the client devices, the bus notifier, and the adapter platform device without draining i2c->work. This can lead to a work item still being queued or running when the adapter is unregistered, causing potential use-after-free issues.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to ensure the i2c client work is properly canceled on remove.
• Verify the Linux kernel version and update to a fixed version if necessary.
• Monitor the Linux kernel and drm/xe/i2c component for any related security advisories or updates.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• 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.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and source item provide details about the vulnerability, including its description and affected versions. However, there is limited information about potential exploits or attacks. Linux kernel users and administrators should verify their systems for exposure and review available patches to address the vulnerability. The vulnerability's impact is primarily related to potential use-after-free issues in the Linux kernel's drm/xe/i2c component. There are no known exploits or attacks at this time, but defenders should be

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.