CVE-2026-98347
Description
A flaw was found in the Linux kernel's IP over InfiniBand (IPoIB) driver. A local user with administrative privileges can cause a Denial of Service (DoS) by triggering a race condition between interface shutdown and multicast flush operations. This timing conflict leaves the interface marked as active, causing background cleanup tasks to loop indefinitely and leading to a kernel deadlock during device teardown.
Statement
This vulnerability is classified as Moderate severity for Red Hat Enterprise Linux because exploitation requires local access, relies on specialized InfiniBand networking environments, and results only in a system hang or denial of service rather than code execution. Systems that do not utilize InfiniBand hardware or IP-over-InfiniBand interfaces are not exposed to this flaw. In addition, successfully causing the deadlock requires precisely timing an interface shutdown during active multicast operations, which substantially limits practical exploitation.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Other); DoS: Crash, Exit, or Restart
Each thread of execution will "hang" and prevent tasks from completing. In some cases, CPU consumption may occur if a lock check occurs in a tight loop.
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