CVE-2026-46304
Description
A flaw was found in the Linux kernel's NVMe over TCP (nvmet) target subsystem. A recursive locking issue can occur when nvmet_tcp_release_queue_work() attempts to flush ctrl->async_event_work on the same workqueue (nvmet-wq) that is already processing a task. This can lead to a deadlock, causing a Denial of Service (DoS) condition for the system.
Statement
This vulnerability is rated as Moderate impact for Red Hat Enterprise Linux because it requires the system to be explicitly configured as an NVMe over Fabrics (NVMe-oF) target and results only in a denial of service. The affected kernel modules are not loaded by default on standard deployments, restricting the attack surface to hosts actively serving NVMe storage over the network. In affected configurations, controller teardown operations can trigger recursive workqueue handling that results in a kernel deadlock, hanging the subsystem without compromising data confidentiality or integrity.
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 | 5.5 | N/A | 7.5 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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