CVE-2026-86573: Out-of-bounds Write Vulnerability in Hitachi Disk Array Driver for AIX, Hitachi Disk Array Driver for Virtual I/O Server

Severity: medium (CVSS 5.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-14 · updated 2026-10-18
Weakness: CWE-787

Description

Out-of-bounds write vulnerability in Hitachi Disk Array Driver for AIX and Hitachi Disk Array Driver for Virtual I/O Server. This issue affects Hitachi Disk Array Driver for AIX: from 01-00 before 01-23-/A; Hitachi Disk Array Driver for Virtual I/O Server: from 01-04 before 01-23-/A.

Affected products

Hitachi Disk Array Driver for AIX: from 01-00 before 01-23-/A — fixed in 01-23-/A
Hitachi Disk Array Driver for Virtual I/O Server: from 01-04 before 01-23-/A — fixed in 01-23-/A

How to fix

Upgrade to a fixed version: Hitachi Disk Array Driver for AIX 01-23-/A; Hitachi Disk Array Driver for Virtual I/O Server 01-23-/A. Check the vendor advisory for mitigations.

References

https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-137/index.html

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