CVE-2026-98358
Description
A flaw was found in the Linux kernel's iSCSI Extensions for Remote Direct Memory Access (iSER) driver. A remote storage target can trigger a Denial of Service (DoS) by sending an unexpected remote invalidation response for write operations transmitted as immediate data. In this scenario, the initiator driver attempts to access an unregistered memory descriptor, resulting in a null pointer dereference and a kernel crash.
Statement
This vulnerability is rated as Moderate impact because triggering the denial of service requires an active connection to an untrusted or compromised remote storage server over iSER, limiting the attack surface. In standard Red Hat Enterprise Linux deployments, the iSER kernel module is not loaded by default and is only utilized when iSCSI over InfiniBand or RoCE is explicitly configured. While a malicious target can crash the host kernel, the issue does not allow privilege escalation or direct data leakage.
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
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