Januscape

Januscape: Guest-to-Host Escape in KVM/x86 Abstract This document describes the Januscape CVE-2026-53359 vulnerability discovered and reported by Hyunwoo Kim @v4bel. It is a KVM escape vulnerability that lets a guest escape to the host in a KVM/x86 environment. To the best of public knowledge, th...

CVE-2026-95109

The Cortex-A7 MMU Modules port validates a caller-supplied buffer by translating one address — the first byte. The common Module Manager hands its range check the module instance, the start address and the complete byte size; the Cortex-A7 implementation discarded the instance and the size and...

CVE-2026-95109 Cortex-A7 module data validation checks only the first address of a caller-supplied range

The Cortex-A7 MMU Modules port validates a caller-supplied buffer by translating one address — the first byte. The common Module Manager hands its range check the module instance, the start address and the complete byte size; the Cortex-A7 implementation discarded the instance and the size and...

EUVD-2026-105145

The Cortex-A7 MMU Modules port validates a caller-supplied buffer by translating one address — the first byte. The common Module Manager hands its range check the module instance, the start address and the complete byte size; the Cortex-A7 implementation discarded the instance and the size and...

CVE-2026-95109

The Cortex-A7 MMU Modules port contains a data validation flaw where it only translates the first byte of a caller-supplied buffer instead of the entire range. While the Module Manager provides the start address and complete byte size, the Cortex-A7 implementation discards the size, allowing memo...

KVM-Januscape

KVM-XJ Hot Patch dumptool.py automatically finds offsets; how to use it? Just read the code. Vulnerability Overview CVE-2026-53359 Januscape is a use-after-free UAF vulnerability in the Linux kernel KVM shadow MMU. Lurking time : 16 years August 2010 to July 2026 Affected range : All Intel/AMD x8...

CVE-2026-53359

🚨 CVE-2026-53359 — Januscape Linux KVM Shadow Paging Use-After-Free Guest-to-Host Escape Januscape is a Linux Kernel KVM vulnerability caused by a Use-After-Free UAF condition in the x86 Shadow MMU. Under vulnerable configurations, a malicious guest can corrupt host memory, leading to host crashe...

Zapscape

The KVM Escape Trilogy ITScape CVE‑2026‑46316 | Januscape CVE‑2026‑53359 | Zapscape CVE‑2026‑64561 ---|---|--- Zapscape: Guest-to-Host Escape in KVM/x86 Abstract This document describes the Zapscape CVE-2026-64561 vulnerability discovered and reported by Hyunwoo Kim @v4bel. It is a KVM escape...

slides

slides A collection of slides. 2025 A tale of challenging MTE: Rooting Google Pixel with kernel MTE enabled in one shot Conference: POC 2025 2024 Simple bug but not easy exploit: Rooting Android devices in one shot Conference: Cansecwest 2024 Almost same with POC 2023, except for MTE 2023 Simple...

UBUNTU-CVE-2026-98717

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

CVE-2026-98717

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

CVE-2026-64561

CVE-2026-64561 — Zapscape: KVM/x86 shadow MMU UAF, guest escape to host root HackSpeak distribution mirror. This repository is a distribution mirror of the complete PoC + technical write-up publicly released by researcher Hyunwoo Kim @v4bel , with code and documentation identical to upstream. ⚠️...

CVE-2026-98717

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

CVE-2026-98717 KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

CVE-2026-98717 KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

CVE-2026-98717

The Linux kernel KVM component is vulnerable to a NULL pointer dereference within the x86/mmu shadow page table walking logic. The issue occurs when a race condition exists between memslot creation and a stage-2 page fault (EPT violation or #NPF) from L2. If the root is a "dummy" root—where the t...

CVE-2026-98717

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

EUVD-2026-103971

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy When walking shadow page tables, immediately terminate the walk if the root is a "dummy" root, i.e. a root whose top-level page table is backed by the zero...

PT-2026-116741

In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Propagate map failures correctly from pvr mmu map sgl Map failure from pvr mmu map sgl interface was not returned correctly to pvr mmu map interface. This resulted in pvr mmu map interface to continue instead of...

Januscape-Hotfix

Januscape Fix Library — CVE-2026-53359 简体中文 Complete fix collection for the CVE-2026-53359 guest-to-host escape vulnerability in the KVM/x86 shadow MMU. From zero-downtime livepatch to kernel upgrade — covers every operational scenario. One-liner Direct curl -sL...