rootpwn

medium · CVSS v3 5.5

CVE-2026-93154

A flaw in the Linux kernel’s RDMA irdma driver allowed userspace to deregister memory regions (MRs) that back QP/CQ/SRQ rings, potentially l

Overview

A flaw in the Linux kernel’s RDMA irdma driver allowed userspace to deregister memory regions (MRs) that back QP/CQ/SRQ rings, potentially leading to kernel memory corruption or a crash. The issue was fixed by adding reference counting to prevent premature deregistration.

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Add refcounting to user ring MRs Prevent userspace from deregistering the MRs that back QP/CQ/SRQ rings by bumping the MR's refcount upon association.

Impact

{'who': 'Local or privileged users with access to the RDMA subsystem', 'confidentiality': 'No direct impact', 'integrity': 'Potential kernel memory corruption', 'availability': 'Possible kernel crash or denial of service'}

Remediation

['Upgrade the kernel to a version that includes the irdma refcounting patch.', 'If the RDMA subsystem is not required, disable or remove the irdma driver.', 'Verify that the kernel is not running any vulnerable irdma modules.', 'Monitor system logs for RDMA-related kernel panics or Oops events.']

Risk context

The CVSS v3 score of 5.5 indicates a medium risk. While the vulnerability does not expose data directly, it can lead to kernel instability. Prompt patching is recommended to avoid potential denial‑of‑service scenarios.

Affected products

  • Linux kernel
  • irdma driver
  • RDMA subsystem
  • Linux 5.x
  • Linux 6.x

Scores

Severity
medium
CVSS v2
3.6
CVSS v3
5.5
CVSS v4
—
EPSS
—

Linux kernel RDMA irdma refcounting kernel crash denial of service

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