CVE-2026-98634
Description
A flaw was found in the Linux kernel's SCSI ZBC (Zoned Block Commands) driver. This vulnerability can lead to a denial of service (DoS) when the system attempts to scan a storage device that reports an excessively large number of zones. Due to integer truncation and overflow during zone calculations, the kernel allocates insufficient resources and fails to manage zone state properly. An attacker capable of connecting a specially crafted storage device could exploit this issue to trigger inconsistent internal bookkeeping and crash the system.
Statement
This vulnerability is rated as Moderate impact because exploitation requires physical access or administrative control to present a specially crafted zoned block device, restricting the failure condition to a local denial of service. Standard enterprise installations do not typically utilize Zoned Block Commands (ZBC) drives, and such media is rarely attached dynamically in production environments. In virtualized settings, an administrator or hypervisor would need to deliberately expose an untrusted zoned storage device to a guest kernel to provoke this issue.
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 | 6.2 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other,Integrity
Technical Impact: Unexpected State; Quality Degradation
The program could wind up using the wrong number and generate incorrect results. If the number is used to allocate resources or make a security decision, then this could introduce a vulnerability.
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