CVE-2026-93054 Linux CVE debrief

Who should care

Linux kernel developers, administrators, and users who rely on the uio subsystem should assess their exposure and take steps to patch or update their kernels. The vulnerability can cause potential use-after-free memory access issues, requiring patching or updating of Linux kernel deployments, and necessitating monitoring for potential issues.

Why it matters

A vulnerability in the Linux kernel's uio subsystem can lead to use-after-free memory access if a UIO device registration fails after the device becomes visible to userspace. Linux kernel developers, administrators, and users who rely on the uio subsystem should assess their exposure and take steps to patch or update their kernels.

• Potential use-after-free memory access issues
• Required patching or updating of Linux kernel deployments
• Monitoring for potential issues

Technical summary

The Linux kernel's uio subsystem has a vulnerability that can lead to use-after-free memory access if a UIO device registration fails after the device becomes visible to userspace. This can occur when an opener races with the failed registration path, causing the open file to keep a reference to the uio_device while the caller sees registration failure and may free its struct uio_info. The vulnerability can cause potential use-after-free memory access issues, requiring patching or updating of Linux kernel deployments.

Defensive priority

High-priority assessment and patching recommended for Linux kernel deployments using the uio subsystem.

Recommended defensive actions

• Assess Linux kernel deployments using the uio subsystem for exposure
• Patch or update the Linux kernel to a version that includes the fix
• Monitor for potential use-after-free memory access issues
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but specific exploitation or impact details are not provided. The vulnerability is caused by a use-after-free memory access issue in the Linux kernel's uio subsystem. The issue occurs when a UIO device registration fails after the device becomes visible to userspace. The CVE record and NVD entry provide details on the vulnerability, but specific exploitation or impact details are not provided. Linux kernel developers, administrators, and users who rely on the uio subs

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.