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...

CVE-2026-98164

The Linux kernel contains a vulnerability in the KVM x86/mmu component. The function kvm_gfn_is_write_tracked() incorrectly checks only the supplied memslot, whereas page tracking is per-address-space and shadow pages are shared across all spaces. In an SMM context, a GFN can be write-tracked in ...

EUVD-2026-88753

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Check write tracking in all address spaces kvmgfniswritetracked checks only the supplied memslot, but page tracking is per-address-space and shadow pages are shared across all address spaces. With SMM, a GFN can...

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...

Januscape

Januscape: Escape de Invitado a Anfitrión en KVM/x86 Resumen Este documento describe la vulnerabilidad Januscape CVE-2026-53359 descubierta e informada por Hyunwoo Kim @v4bel. Es una vulnerabilidad de escape de KVM que permite que un invitado escape al anfitrión en un entorno KVM/x86. Hasta donde...

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...

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. ⚠️...

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...

CVE-2026-89928 KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk kvmrmaplock deliberately elides the rmap lock when it observes an empty rmap. In that case kvmrmaplockreadonly also re-enables preemption and returns zero, so...

CVE-2026-89928 KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk kvmrmaplock deliberately elides the rmap lock when it observes an empty rmap. In that case kvmrmaplockreadonly also re-enables preemption and returns zero, so...

CVE-2026-89928

CVE-2026-89928 is a slab use-after-free in the Linux kernel's KVM x86/mmu subsystem. The root cause is a race condition in the lockless reverse-mapping (rmap) walk: kvm_rmap_age_gfn_range() ignores the value returned by kvm_rmap_lock_readonly() and instead re-reads the rmap head via rmap_get_firs...

EUVD-2026-80296

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation Computing the effects of a TLB invalidation involves looking at the size of the mapping cached by the TLB. For S1 mappings such as VNCR, this is deducted from...

CVE-2026-89928: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk kvmrmaplock deliberately elides the rmap lock when it observes an empty rmap. In that case kvmrmaplockreadonly also re-enables preemption and returns zero, so...

CVE-2026-89916: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry A VNCR TLB invalidation can occur on one vcpu while another vcpu is faulting in this same page. Without correctly handling this, we can end up with the...

OESA-2026-3709 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Check for invalid/obsolete root after making MMU pages available\n\nCheck for a "stale" page fault, i.e. for an invalid and/or obsolete root, after...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: Avoid unnecessary calls to invalidrangestart/invalidaterangeend when using mremap with oldsize=0. If the mremap system call with oldsize=0 ends up in movepagetables, it will unnecessarily call...

Astra Linux – Vulnerability in Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: drm/panfrost: Fixed the error path in panfrostmmumapfaultaddr Subject: PATCH drm/panfrost: Fixed the error path in panfrostmmumapfaultaddr If some of the page allocations fail, we should not release the previous references to tho...

Astra Linux – Vulnerability in Linux

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Immediately reset the MMU context when the SMM flag is cleared The MMU context should be reset immediately when the SMM flag of the vCPU is cleared, so that the SMM flag in the MMU context is always synchronized with th...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: IB/hfi1: Fixed bugs related to non-PAGESIZE-end multi-iovec user SDMA requests. The processing of hfi1 user SDMA requests contains two bugs that can cause data corruption for user SDMA requests with multiple payload iovecs. In...