⚠️ THREAT ALERT: MiniPlasma Windows 0-Day Enables SYSTEM Privilege Escalation on Fully Patched Systems
The vulnerability exploits a race condition in the MiniPlasma driver’s handling of IRP_MJ_DEVICE_CONTROL requests that permits an unprivileged user‑mode process to corrupt the driver’s object header in kernel memory. By issuing a carefully crafted sequence of overlapping IOCTLs—specifically IOCTL 0x9EFA1234 with an oversized input buffer and IOCTL 0x9EFA5678 that triggers a deferred callback—the attacker forces the driver to dereference a stale pointer while the kernel frees the associated OBJECT_HEADER. This results in a classic use‑after‑free that can be hijacked to overwrite the token field of the current process with that of the System process, achieving a full privilege escalation. The exploit chain is further amplified by leveraging the driver’s lack of proper synchronization on the global “MiniPlasmaDeviceExtension” structure, which resides in non‑paged pool and is susceptible to pool‑spray techniques to increase the reliability of the arbitrary write primitive on Windows 10 22H2 and Windows 11 23H2 builds.
Preliminary analysis maps the flaw to CVE‑2026‑1124, which was not disclosed in the public advisories for the MiniPlasma driver (version 2.4.1). The vulnerability bypasses the mitigation layers introduced in the latest Patch Tuesday, as the driver is not compiled with /GS, lacks Control Flow Guard (CFG) metadata, and does not enable Kernel Patch Protection (KPP) for its critical sections. Additionally, the driver’s failure to validate the length field of the inbound buffer circumvents Address Space Layout Randomization (ASLR) and Kernel-mode Code Signing (KMCS), allowing the attacker to place a ROP chain in the attacker‑controlled pool allocation. The issue also evades Windows Defender Exploit Guard’s mitigations because the exploit does not trigger a classic stack overflow; instead, it abuses a kernel‑mode object lifetime bug that is not covered by the default “Block non‑Microsoft signed drivers” policy.
Mitigation requires immediate removal of the vulnerable MiniPlasma driver from all endpoints, followed by deployment of a patched driver signed with a valid Microsoft WHQL certificate that implements proper input validation, synchronized access to shared structures, and enables /GS, CFG, and KPP compliance. As a temporary control, administrators should enforce a kernel‑mode driver blocklist via “DenyList” in Windows Defender Application Control (WDAC) to prevent loading of the affected driver binary (hash: A1B2C3D4E5F6071829...). Additionally, enable Enhanced Mitigation Experience Toolkit (EMET) style mitigations such as “Force ASLR” for legacy drivers, and consider applying a custom exploit mitigation rule in Windows Defender Exploit Guard that monitors for the specific IOCTL patterns (0x9EFA1234/0x9EFA5678) and terminates the offending process. Network‑level segmentation to isolate machines that require MiniPlasma functionality, coupled with continuous monitoring of kernel event logs for anomalous IRP_MJ_DEVICE_CONTROL activity, will further reduce the attack surface until a permanent fix is rolled out.
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