# CVE-2026-91764: Hitachi Dynamic Link Manager for Linux improper link resolution

Source: https://junglewise.ai/threats/cve-2026-91764-improper-link-resolution-before-file-access-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-91764 · Severity: high · CVSS 8.1 · Published 2026-11-10

Hitachi Dynamic Link Manager for Linux is a storage management utility that controls disk operations and data paths on Linux systems. A flaw in how the software resolves symbolic links allows a local attacker to manipulate file access and gain unauthorized privileges, potentially compromising system integrity and data confidentiality. An attacker with local access and user interaction can exploit this to write to arbitrary files or escalate privileges.

Technologies: [Hitachi Dynamic Link Manager for Linux](https://junglewise.ai/threats/technologies/dynamic-link-manager-for-linux). Vendors: [Hitachi](https://junglewise.ai/threats/vendors/hitachi).

## Quick answers

**Is CVE-2026-91764 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91764 being exploited in the wild.

**How severe is CVE-2026-91764?** High severity, with a CVSS score of 8.1, published 10 November 2026.

**Which products and versions are affected?** Hitachi Dynamic Link Manager for Linux 6.1.1-00 to 9.0.3-01.

**Is there a fix for CVE-2026-91764?** Yes: fixed in 9.0.5-00. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-91764 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-91764?** Check whether you run Hitachi Dynamic Link Manager for Linux at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 9.0.5-00

## Technical details

This is an improper link resolution (TOCTOU/symlink-following) vulnerability in Hitachi Dynamic Link Manager for Linux. The vulnerability exists in versions 6.1.1-00 through 9.0.3-01 and requires local access with low privileges and user interaction. An attacker can exploit this by crafting symlinks to redirect file operations to sensitive files, leading to information disclosure and privilege escalation.

## Affected products

- Hitachi Dynamic Link Manager for Linux 6.1.1-00 to 9.0.3-01

## Timeline

- 2026-11-10: disclosed

## References

- [https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html](https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-166/index.html)

## Related threats

- [Hitachi Dynamic Link Manager for Linux symlink following vulnerability](https://junglewise.ai/threats/cve-2026-91763-unix-symbolic-link-symlink-following-vulnerability-in-hitachi)
- [Hitachi Dynamic Link Manager for Linux symlink following vulnerability](https://junglewise.ai/threats/cve-2026-91762-unix-symbolic-link-symlink-following-vulnerability-in-hitachi)
- [Hitachi Dynamic Link Manager for Linux symlink following vulnerability](https://junglewise.ai/threats/cve-2026-91761-unix-symbolic-link-symlink-following-vulnerability-in-hitachi)
- [Hitachi Dynamic Link Manager for Linux heap buffer overflow](https://junglewise.ai/threats/cve-2026-91760-heap-based-buffer-overflow-vulnerability-in-hitachi-dynamic-link)
- [Hitachi Dynamic Link Manager for Linux out-of-bounds write](https://junglewise.ai/threats/cve-2026-91759-out-of-bounds-write-vulnerability-in-hitachi-dynamic-link-manager)