🚨Avast Reveals Windows 11 Kernel Bug CVE-2025-13032 Exploitation
Double-fetch flaw leads to full system compromise
TL;DR
Avast's latest research details how a double-fetch flaw in Windows 11 leads to a full system compromise. The bug, CVE-2025-13032, allows for arbitrary kernel read/write access, enabling local privilege escalation on up-to-date systems.
Avast's research reveals a critical double-fetch flaw in Windows 11, CVE-2025-13032, which leads to a full system compromise. The bug allows for arbitrary kernel read/write access, enabling local privilege escalation on up-to-date systems. This affects any system running Windows 11, as the bug is exploitable without needing outdated software. The research shows that the bug is fixed by user-mode accessors (UMA) in the latest Windows kernel and drivers, preventing unauthorized kernel access to user-mode memory. The exploit leverages the I/O Ring Object's `RegBuffers` field in the paged pool, corrupting a single pointer to gain full control.
Key Points
CVE-2025-13032 is a double-fetch issue leading to a kernel pool overflow, exploitable on up-to-date Windows 11 systems.
The bug is fixed by user-mode accessors (UMA) in the latest Windows kernel and drivers, preventing unauthorized kernel access to user-mode memory.
The I/O Ring Object's `RegBuffers` field in the paged pool is a key target for exploitation, corrupting a single pointer for full control.
Exploitation involves a second thread running in a tight loop, continuously toggling the `Length` field of the shared `_UNICODE_STRING`.
The main thread calls the vulnerable IOCTL in a loop, leading to more bytes being copied than allocated, causing the pool overflow.
Why It Matters
If you're running Windows 11, this bug is a major security concern. The double-fetch flaw allows for arbitrary kernel read/write access, enabling local privilege escalation. The fix is in the latest Windows updates, but anyone on older systems needs to update immediately. The exploit uses the I/O Ring Object's `RegBuffers` field in the paged pool, making heap spraying viable. This affects any system running Windows 11, as the bug is exploitable without needing outdated software.
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