CVE-2026-63807

A flaw was found in the Linux kernel's Kernel-based Virtual Machine KVM x86 memory management unit MMU. A malicious guest operating system could create a hugepage mapping that extends beyond the boundaries of its allocated memory slot. This improper handling of memory boundaries by KVM can lead t...

CVE-2026-64104 virt: sev-guest: Explicitly leak pages in unknown state

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Explicitly leak pages in unknown state When setmemoryencrypted,decrypted fail, the user cannot know at which point the function failed, meaning that the pages are left in an unknown state from the point of view o...

CVE-2026-64104

CVE-2026-64104 (Linux kernel) affects virt: sev-guest where set_memory_encrypted()/set_memory_decrypted() can fail leaving pages in an unknown state, potentially unencrypted and not safely returnable to the buddy allocator. The provided documentation notes that to avoid this, the pages should not...

CVE-2026-63807 KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level When recovering hugepages in the shadow MMU, verify that the base gfn of the shadow page is actually contained within the target memslot, before queryi...

CVE-2026-63794 KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Fix page overflow in sevdbgcrypt for ENCRYPT path In sevdbgcrypt, the per-iteration transfer length is bounded by the source page offset PAGESIZE - soff but not by the destination page offset PAGESIZE - doff. When doff...

CVE-2026-3842

A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpuphysicalmemorymap returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in...

CVE-2026-3842 Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write

A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpuphysicalmemorymap returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in...

CVE-2026-3842

A flaw was found in QEMU. This vulnerability allows a local attacker within a guest virtual machine to write data beyond its allocated memory. This occurs when cpuphysicalmemorymap returns a shorter length than expected, leading to an out-of-bounds write. Successful exploitation could result in...

kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role

A flaw was found in the Linux kernel's Kernel-based Virtual Machine KVM x86 shadow paging mechanism. This vulnerability occurs when a host page directory entry PDE mapping is changed from within the guest, leading to an unexpected role mismatch in shadow paging. This mismatch can cause a...

CVE-2025-58151

varstored is a component of the Xapi toolstack handling UEFI Variables for a VM. It has a communication path with OVMF inside the VM involving mapping a buffer prepared by OVMF. Within varstored, there were insufficient compiler barriers, creating TOCTOU issues with data in the shared buffer. The...

CVE-2025-58151

CVE-2025-58151 affects varstored, a Xen/Xapi component that handles UEFI variables and maps guest memory to OVMF. The vulnerability arises from TOCTOU due to insufficient compiler barriers in the shared buffer, with exploitation depending on compiler-generated code, and the attacker potentially c...

UBUNTU-CVE-2026-53360

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use As per the GHCB spec, when using GHCB v2+ require the software scratch area to reside in the GHCB's shared buffer. Note, things like Page State Change PSC requests rely...

EUVD-2026-41667

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use As per the GHCB spec, when using GHCB v2+ require the software scratch area to reside in the GHCB's shared buffer. Note, things like Page State Change PSC requests rely...

CVE-2026-53345

CVE-2026-53345 affects the Linux kernel KVM implementation. The issue arises when marking a guest page dirty: a warning is emitted about not having a running vCPU unless the VM’s refcount is non-zero, which could leak memory for SEV-ES guests. Connected advisories show Debian/Ubuntu/RootOS patche...

EUVD-2026-38042

An integer overflow vulnerability was found in the virtio-snd device via PCMINFO requests from the guest. A malicious guest can provide out-of-bounds stream counts, potentially leading to unbounded memory allocation on the host and a denial of service condition...

EUVD-2024-55617

Improper input validation for DIMM serial presence detect SPD metadata could allow an attacker with physical access, ring0 access on a system with a non-compliant DIMM, or control over the Root of Trust for BIOS update, to potentially overwrite guest memory resulting in loss of guest data integri...

CVE-2024-21944

Improper input validation for DIMM serial presence detect SPD metadata could allow an attacker with physical access, ring0 access on a system with a non-compliant DIMM, or control over the Root of Trust for BIOS update, to potentially overwrite guest memory resulting in loss of guest data integri...

CVE-2024-21944

CVE-2024-21944 maps to an AMD SEV-SNP/ASP issue where SPD metadata can be improperly validated. Research show BadRAM-style exploits that can cause a memory module to misreport size, enabling a local attacker with ring0 or physical access to overwrite guest memory and compromise guest data integri...

CVE-2024-21944

Improper input validation for DIMM serial presence detect SPD metadata could allow an attacker with physical access, ring0 access on a system with a non-compliant DIMM, or control over the Root of Trust for BIOS update, to potentially overwrite guest memory resulting in loss of guest data integri...

CVE-2024-21944

Improper input validation for DIMM serial presence detect SPD metadata could allow an attacker with physical access, ring0 access on a system with a non-compliant DIMM, or control over the Root of Trust for BIOS update, to potentially overwrite guest memory resulting in loss of guest data integri...