ITScape

ITScape: Guest-to-Host Escape in KVM/arm64 Abstract This document describes the ITScape CVE-2026-46316 vulnerability reported and patched by Hyunwoo Kim @v4bel. It is a KVM escape vulnerability that lets a guest escape to the host in a KVM/arm64 environment and run commands on the host with kerne...

CVE-2026-89775

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...

UBUNTU-CVE-2026-89775

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-2026-89913

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-v3: take an LPI reference in vgicv3savependingtables vgicv3savependingtables iterates dist-lpixa using xaforeach and dereferences the returned struct vgicirq in the loop body without holding a reference on the LP...

CVE-2026-89918

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start an...

DEBIAN-CVE-2026-89913

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-v3: take an LPI reference in vgicv3savependingtables vgicv3savependingtables iterates dist-lpixa using xaforeach and dereferences the returned struct vgicirq in the loop body without holding a reference on the LP...

CVE-2026-89915

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Remove VM-wide VNCR mapping counter The global VNCR mapping counter is used to decide whether an L1 provided VNCR page is mapped in L0 on any CPU at the point of dealing with a TLB invalidation. It is incremented when...

DEBIAN-CVE-2026-89916

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...

AZL-101282 CVE-2026-89913 affecting package kernel 6.6.150.1-1

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-v3: take an LPI reference in vgicv3savependingtables vgicv3savependingtables iterates dist-lpixa using xaforeach and dereferences the returned struct vgicirq in the loop body without holding a reference on the LP...

CVE-2026-89914

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Sign-extend VA for range-based TLBI invalidation When the decoderangetlbi helper was moved to be used for S1 TLBIs, the required sign extension was omitted. Add it. As a result, special care must be taken to not...

CVE-2026-89911

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly cap TLBI Range to the architural limit TLB Invalidation by Range has a fairly powerful way of encoding pretty large ranges in a small number of bits. This range can be based on an arbitrary VA, which means i...

CVE-2026-89916

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...

EUVD-2026-80518

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start an...

CVE-2026-89918

CVE-2026-89918 affects the Linux kernel KVM arm64 subsystem. The root cause is a flaw in the TLB invalidation (TLBI) by virtual address range: when the TLBI instruction's range reaches the end of the TTBR1 VA space , the expression base + size wraps around to 0, causing the range comparison to fa...

CVE-2026-89918 KVM: arm64: Correctly handle end of VA space TLBI invalidation

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start an...

CVE-2026-89917 KVM: arm64: Handle VNCR TLB invalidation race with vcpu_put() VNCR unmapping

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Handle VNCR TLB invalidation race with vcpuput VNCR unmapping While VNCR TLB invalidation always occurs under the MMU lock, vcpuput doesn't, while it unmaps the VNCR page. The problem is that the invalidation evaluate...

CVE-2026-89917

A race condition in the Linux kernel's KVM arm64 hypervisor exists between the VNCR TLB invalidation path (which runs under the MMU lock) and vcpu_put() 's VNCR unmapping (which does not). The TOCTOU pattern on the TLB path checks vncr_tlb::cpu before unmapping, while this_cpu_reset_vncr_fixmap()...

EUVD-2026-80517

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Handle VNCR TLB invalidation race with vcpuput VNCR unmapping While VNCR TLB invalidation always occurs under the MMU lock, vcpuput doesn't, while it unmaps the VNCR page. The problem is that the invalidation evaluate...

CVE-2026-89916 KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry

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...

CVE-2026-89915

This vulnerability affects the Linux kernel's KVM arm64 subsystem, where a flawed VM-wide VNCR mapping counter is used to decide whether an L1-provided VNCR page is mapped in L0 during TLB invalidation. The counter can result in missed TLB invalidations , and fails when an L1 vCPU invalidates its...