Monivisor Top Full Crack

| # | Contribution | Section | |---|--------------|---------| | 1 | Discovery via fuzz‑testing of TOP handling | 2 | | 2 | Full exploit chain (guest → host RCE) | 3 | | 3 | Impact analysis across releases & configurations | 4 | | 4 | Mitigation strategies & vendor patch | 5 |

| Date | Event | |------|-------| | 12 Jan 2026 | Private disclosure to Monivisor Security Team. | | 14 Jan 2026 | Vendor acknowledges receipt and assigns CVE. | | 4 Feb 2026 | Public patch released (2.8.1). | | 7 Feb 2026 | This paper submitted to USENIX Security. | | 22 Feb 2026 | Paper accepted (subject to minor revisions). |

| Monivisor Version | Affected? | Patch Applied? | |-------------------|-----------|----------------| | 2.4.0 – 2.5.3 | ✅ | No | | 2.6.0 – 2.7.5 | ✅ | No | | 2.8.0 (pre‑patch) | ✅ | No | | 2.8.1 (post‑patch) | ❌ | Yes (CVE‑2026‑12345) |

| Test | Input (hex) | Observed Effect | |------|-------------|-----------------| | 1 | 0xFFFF_FFFF_FFFF_FF00 (TOP_ADDR) | No bounds violation – accepted | | 2 | 0x1_0000_0000_0000_0000 (TOP_ADDR) | Host page‑fault → oops (NULL deref) | | 3 | 0xFFFF_FFFF_FFFF_FFFF (TOP_ADDR) | Overwrites vmcs->guest_RIP – leads to RCE |

The vulnerability stems from line 78 in top_set() (Monivisor 2.6 source):

/* BUG: No high‑bit mask on addr */
hmt_entry->addr = val & TOP_ADDR_MASK;   // TOP_ADDR_MASK = 0xFFFFFFFFFFFFFFFFULL

The intended mask should have been 0x0000FFFFFFFFFFFFULL (48‑bit). The missing mask permits full 64‑bit writes.

| Ref | Topic | Relevance | |-----|-------|-----------| | [1] | VENOM (CVE‑2015‑3456) | Hyper‑visor I/O bug. | | [2] | L1TF (CVE‑2018‑3615) | Speculative execution RCE. | | [3] | “Register‑Based Attacks on ARM TrustZone” (IEEE S&P 2022) | Shows the power of unchecked register writes. | | [4] | “Fuzzing Hyper‑visor Interfaces” (NDSS 2024) | Provides methodology we adopted. |

Our work differs in that **MTFC targets a 64‑bit register that

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The glowing fracture on the screen wasn't just a physical break; it was a digital wound. In the hyper-connected city of Oakhaven, the Monivisor was more than a device—it was a literal lens through which every citizen viewed their world, filtered their social status, and managed their oxygen levels.

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"E-Elias... your status is... f-failing. The view is... compromised," she whispered through the earpiece.

He went to swipe the "Repair" icon, but his finger caught on a sharp edge. A drop of blood smeared across the sensor. Suddenly, the Monivisor didn’t just glitch—it inverted. how to use the software legitimately)

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Elias put the repair kit away. He didn't want a perfect view anymore; he wanted the truth, even if it was broken.

| Vulnerability | Hyper‑visor | Attack Vector | Time‑to‑Compromise | |---------------|-------------|---------------|--------------------| | MTFC | Monivisor | TOP register write | 2.8 s | | VENOM (CVE‑2015‑3456) | QEMU | Floppy controller | 4–6 s | | L1TF | Intel CPUs | Speculative execution | < 1 s (hardware) |

MTFC is the first publicly disclosed hyper‑visor bug that exploits a full‑width register write rather than a traditional VM‑exit or I/O path.

We built a register‑fuzz harness based on AFL++ that repeatedly sends malformed TOP writes from a minimal guest. The harness logs any kernel oops, VM‑exit anomalies, or host‑side crashes.

Multivisor or multi-monitor software solutions are designed to help users manage and utilize multiple monitors efficiently. These solutions can offer extended desktop support, allowing users to span their work or gaming environments across several screens.