CVE-2026-12166

System crash via NULL pointer dereference

Published Jul 2, 2026 · Updated Jul 2, 2026

NULL pointer dereference in Little Orbit GamersFirst Anti-Cheat 0 through 2025-07-07 allows local users to crash Windows systems. The GFAC_Sys_x64.sys driver's initialization and request-handling logic dereferences a NULL address after crafted requests arrive through its minifilter communication port. Any standard non-administrative local user can reach the path; successful triggering causes a blue-screen crash, and repeated requests can interrupt host availability.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Little Orbit GamersFirst Anti-Cheat 0 through 2025-07-07 allows local users to crash Windows systems. The GFAC_Sys_x64.sys driver's initialization and request-handling logic dereferences a NULL address after crafted requests arrive through its minifilter communication port. Any standard non-administrative local user can reach the path; successful triggering causes a blue-screen crash, and repeated requests can interrupt host availability.

The record

CVE
CVE-2026-12166
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
Little Orbit
Product
GamersFirst Anti-Cheat
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2025-07-07

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Little Orbit · GamersFirst Anti-Cheatversion=0 <=2025-07-07

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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