CVE-2026-98634

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.

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.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.