A Leader in the 2026 Gartner® Magic Quadrant™ for Endpoint Protection. Six years running.Six years. Gartner® Magic Quadrant™ Leader.Find Out Why
Experiencing a Breach?Blog
Get StartedContact Us
SentinelOne
  • Platform
    Platform Overview
    • Singularity Platform
      Welcome to Integrated Enterprise Security
    • AI for Security
      Leading the Way in AI-Powered Security Solutions
    • Securing AI
      Accelerate AI Adoption with Secure AI Tools, Apps, and Agents.
    • How It Works
      The Singularity XDR Difference
    • Singularity Marketplace
      One-Click Integrations to Unlock the Power of XDR
    • Pricing & Packaging
      Comparisons and Guidance at a Glance
    Data & AI
    • Purple AI
      Accelerate SecOps with Generative AI
    • Singularity Hyperautomation
      Easily Automate Security Processes
    • AI-SIEM
      The AI SIEM for the Autonomous SOC
    • AI Data Pipelines
      Security Data Pipeline for AI SIEM and Data Optimization
    • Singularity Data Lake
      AI-Powered, Unified Data Lake
    • Singularity Data Lake for Log Analytics
      Seamlessly Ingest Data from On-Prem, Cloud or Hybrid Environments
    Endpoint Security
    • Singularity Endpoint
      Autonomous Prevention, Detection, and Response
    • Singularity XDR
      Native & Open Protection, Detection, and Response
    • Singularity RemoteOps Forensics
      Orchestrate Forensics at Scale
    • Singularity Threat Intelligence
      Comprehensive Adversary Intelligence
    • Singularity Vulnerability Management
      Application & OS Vulnerability Management
    • Singularity Identity
      Identity Threat Detection and Response
    Cloud Security
    • Singularity Cloud Security
      Block Attacks with an AI-Powered CNAPP
    • Singularity Cloud Native Security
      Secure Cloud and Development Resources
    • Singularity Cloud Workload Security
      Real-Time Cloud Workload Protection Platform
    • Singularity Cloud Data Security
      AI-Powered Threat Detection for Cloud Storage
    • Singularity Cloud Security Posture Management
      Detect and Remediate Cloud Misconfigurations
    Securing AI
    • Prompt Security
      Secure AI Tools Across Your Enterprise
  • Why SentinelOne?
    Why SentinelOne?
    • Why SentinelOne?
      Cybersecurity Built for What’s Next
    • Our Customers
      Trusted by the World’s Leading Enterprises
    • Industry Recognition
      Tested and Proven by the Experts
    • About Us
      The Industry Leader in Autonomous Cybersecurity
    Compare SentinelOne
    • Arctic Wolf
    • Broadcom
    • CrowdStrike
    • Cybereason
    • Microsoft
    • Palo Alto Networks
    • Sophos
    • Splunk
    • Trellix
    • Trend Micro
    • Wiz
    Verticals
    • Energy
    • Federal Government
    • Finance
    • Healthcare
    • Higher Education
    • K-12 Education
    • Manufacturing
    • Retail
    • State and Local Government
  • Services
    Managed Services
    • Managed Services Overview
      Wayfinder Threat Detection & Response
    • Threat Hunting
      World-Class Expertise and Threat Intelligence
    • Managed Detection & Response
      24/7/365 Expert MDR Across Your Entire Environment
    • Incident Readiness & Response
      DFIR, Breach Readiness, & Compromise Assessments
    Support, Deployment, & Health
    • Technical Account Management
      Customer Success with Personalized Service
    • SentinelOne GO
      Guided Onboarding & Deployment Advisory
    • SentinelOne University
      Live and On-Demand Training
    • Services Overview
      Comprehensive Solutions for Seamless Security Operations
    • SentinelOne Community
      Community Login
  • Partners
    Our Network
    • MSSP Partners
      Succeed Faster with SentinelOne
    • Singularity Marketplace
      Extend the Power of S1 Technology
    • Cyber Risk Partners
      Enlist Pro Response and Advisory Teams
    • Technology Alliances
      Integrated, Enterprise-Scale Solutions
    • SentinelOne for AWS
      Hosted in AWS Regions Around the World
    • Channel Partners
      Deliver the Right Solutions, Together
    • SentinelOne for Google Cloud
      Unified, Autonomous Security Giving Defenders the Advantage at Global Scale
    • Partner Locator
      Your Go-to Source for Our Top Partners in Your Region
    Partner Portal→
  • Resources
    Resource Center
    • Case Studies
    • Data Sheets
    • eBooks
    • Reports
    • Videos
    • Webinars
    • Whitepapers
    • Events
    View All Resources→
    Blog
    • Feature Spotlight
    • For CISO/CIO
    • From the Front Lines
    • Identity
    • Cloud
    • macOS
    • SentinelOne Blog
    Blog→
    Tech Resources
    • SentinelLABS
    • Ransomware Anthology
    • Cybersecurity 101
  • About
    About SentinelOne
    • About SentinelOne
      The Industry Leader in Cybersecurity
    • Investor Relations
      Financial Information & Events
    • SentinelLABS
      Threat Research for the Modern Threat Hunter
    • Careers
      The Latest Job Opportunities
    • Press & News
      Company Announcements
    • Cybersecurity Blog
      The Latest Cybersecurity Threats, News, & More
    • FAQ
      Get Answers to Our Most Frequently Asked Questions
    • DataSet
      The Live Data Platform
    • S Foundation
      Securing a Safer Future for All
    • S Ventures
      Investing in the Next Generation of Security, Data and AI
  • Pricing
Get StartedContact Us
CVE Vulnerability Database
Vulnerability Database/CVE-2026-31492

CVE-2026-31492: Linux Kernel RDMA/irdma Use Vulnerability

CVE-2026-31492 is a use-before-initialization flaw in the Linux Kernel's RDMA/irdma driver that affects QP cleanup operations. This article covers the technical details, affected kernel versions, and mitigation strategies.

Updated: May 16, 2026

CVE-2026-31492 Overview

CVE-2026-31492 is a medium-severity vulnerability in the Linux kernel's RDMA/irdma driver. The flaw resides in the irdma_create_qp function, where the free_qp completion structure is used before initialization. When ib_copy_to_udata fails during queue pair creation, the kernel invokes irdma_destroy_qp for cleanup, which then waits on the uninitialized free_qp completion. This results in undefined behavior and potential denial of service on systems using Intel Ethernet RDMA hardware. The vulnerability is classified under CWE-908: Use of Uninitialized Resource.

Critical Impact

A local authenticated user can trigger an uninitialized resource use in the kernel's RDMA path, leading to kernel instability and denial of service on affected Linux systems.

Affected Products

  • Linux Kernel 5.14 and subsequent stable branches incorporating the irdma driver
  • Linux Kernel 7.0 release candidates (rc1 through rc7)
  • Systems using Intel Ethernet RDMA (irdma) with InfiniBand verbs interface

Discovery Timeline

  • 2026-04-22 - CVE-2026-31492 published to NVD
  • 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-31492

Vulnerability Analysis

The vulnerability exists in the Intel Ethernet RDMA (irdma) driver within the Linux kernel's InfiniBand (IB) subsystem. The irdma_create_qp function creates a queue pair (QP) for RDMA communication and copies user-space data via ib_copy_to_udata. If this copy operation fails, the driver invokes irdma_destroy_qp as an error recovery path.

The cleanup function waits on the free_qp completion object to synchronize queue pair destruction. However, the completion was not initialized before the failing ib_copy_to_udata call. Waiting on an uninitialized struct completion produces undefined kernel behavior, including possible hangs, deadlocks, or kernel panics affecting system availability.

Root Cause

The root cause is improper initialization ordering in irdma_create_qp. The free_qp completion structure was initialized later in the function flow, after ib_copy_to_udata. Error paths reachable before that initialization point reference an uninitialized synchronization primitive. The fix moves init_completion for free_qp to occur before any code path that could trigger irdma_destroy_qp.

Attack Vector

Exploitation requires local access with privileges to open RDMA device files and issue verbs requests. An attacker with access to /dev/infiniband/uverbs* devices can trigger queue pair creation requests crafted to force ib_copy_to_udata failures. Repeated triggering produces kernel-level disruption, denying service to legitimate workloads on the host. The attack does not require user interaction and impacts availability only, with no confidentiality or integrity exposure.

The vulnerability manifests in the queue pair creation error path. See the upstream kernel commits referenced below for complete technical details and the corrective patch.

Detection Methods for CVE-2026-31492

Indicators of Compromise

  • Kernel log entries referencing irdma_create_qp failures followed by hangs in irdma_destroy_qp
  • Soft lockup or hung task warnings naming the irdma driver in dmesg output
  • Unexpected kernel taints or panics on hosts using Intel Ethernet RDMA hardware

Detection Strategies

  • Inventory all Linux hosts running kernel 5.14 or later with the irdma module loaded using lsmod | grep irdma
  • Audit running kernel versions against the patched commits listed in vendor advisories
  • Monitor for processes invoking ibv_create_qp from unprivileged or unexpected accounts

Monitoring Recommendations

  • Enable kernel audit logging for InfiniBand verbs device access under /dev/infiniband/
  • Forward dmesg and journalctl -k output to a central log platform for kernel error correlation
  • Alert on repeated queue pair creation failures from the same user context

How to Mitigate CVE-2026-31492

Immediate Actions Required

  • Apply the upstream Linux kernel patches that initialize the free_qp completion before ib_copy_to_udata
  • Restrict access to /dev/infiniband/uverbs* devices to trusted users and service accounts only
  • Unload the irdma kernel module on systems that do not require RDMA functionality

Patch Information

The Linux kernel maintainers released fixes across multiple stable branches. Refer to the following commits for the corrective changes:

  • Linux Kernel Commit 11a9552
  • Linux Kernel Commit 3cb88c1
  • Linux Kernel Commit ac1da7b
  • Linux Kernel Commit af31040
  • Linux Kernel Commit cd1534c
  • Linux Kernel Commit f729968

Workarounds

  • Blacklist the irdma kernel module on hosts that do not require Intel Ethernet RDMA functionality
  • Apply strict filesystem permissions on InfiniBand uverbs device nodes to limit local access
  • Isolate untrusted workloads from hosts exposing RDMA verbs interfaces
bash
# Blacklist the irdma module to prevent loading
echo "blacklist irdma" | sudo tee /etc/modprobe.d/blacklist-irdma.conf
sudo rmmod irdma

# Restrict access to InfiniBand uverbs devices
sudo chmod 0660 /dev/infiniband/uverbs*
sudo chown root:rdma /dev/infiniband/uverbs*

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

  • Vulnerability Details
  • TypeOther

  • Vendor/TechLinux Kernel

  • SeverityMEDIUM

  • CVSS Score5.5

  • EPSS Probability0.01%

  • Known ExploitedNo
  • CVSS Vector
  • CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • Impact Assessment
  • ConfidentialityLow
  • IntegrityNone
  • AvailabilityHigh
  • CWE References
  • CWE-908
  • Vendor Resources
  • Linux Kernel Commit 11a9552

  • Linux Kernel Commit 3cb88c1

  • Linux Kernel Commit ac1da7b

  • Linux Kernel Commit af31040

  • Linux Kernel Commit cd1534c

  • Linux Kernel Commit f729968
  • Related CVEs
  • CVE-2026-46239: Linux Kernel OV5647 PM Refcount Leak

  • CVE-2026-46235: Linux Kernel saa7164 Memory Vulnerability

  • CVE-2026-46230: Linux Kernel AMDGPU VCN3 OOB Vulnerability

  • CVE-2026-46224: Linux Kernel DRM/XE Memory Leak Bug
Default Legacy - Prefooter | Experience the World’s Most Advanced Cybersecurity Platform

Experience the Most Advanced Cybersecurity Platform

See how the world’s most intelligent, autonomous cybersecurity platform can protect your organization today and into the future.

Try SentinelOne
  • Get Started
  • Get a Demo
  • Product Tour
  • Why SentinelOne
  • Pricing & Packaging
  • FAQ
  • Contact
  • Contact Us
  • Customer Support
  • SentinelOne Status
  • Language
  • Platform
  • Singularity Platform
  • Singularity Endpoint
  • Singularity Cloud
  • Singularity AI-SIEM
  • Singularity Identity
  • Singularity Marketplace
  • Purple AI
  • Services
  • Wayfinder TDR
  • SentinelOne GO
  • Technical Account Management
  • Support Services
  • Verticals
  • Energy
  • Federal Government
  • Finance
  • Healthcare
  • Higher Education
  • K-12 Education
  • Manufacturing
  • Retail
  • State and Local Government
  • Cybersecurity for SMB
  • Resources
  • Blog
  • Labs
  • Case Studies
  • Videos
  • Product Tours
  • Events
  • Cybersecurity 101
  • eBooks
  • Webinars
  • Whitepapers
  • Press
  • News
  • Ransomware Anthology
  • Company
  • About Us
  • Our Customers
  • Careers
  • Partners
  • Legal & Compliance
  • Security & Compliance
  • Investor Relations
  • S Foundation
  • S Ventures

©2026 SentinelOne, All Rights Reserved.

Privacy Notice Terms of Use

English