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VMSCAPE is an x86 Linux kernel speculative-execution vulnerability caused by insufficient branch-predictor isolation between a guest virtual machine and a userspace hypervisor process, such as QEMU. A malicious guest can poison branch-predictor state that persists across a VM exit and is subsequently consumed when execution returns to userspace. Existing protections cover the kernel and KVM boundary, but did not protect the post-VM-exit userspace hypervisor boundary. The upstream fix conditionally issues an Indirect Branch Prediction Barrier (IBPB) after VM exit and before returning to userspace, flushing potentially attacker-controlled branch-predictor state.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
91 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Intel CPU 'VMScape' issue tracked as CVE-2025-40300 affecting KVM hosts. The content indicates embargoed kernel patches were prepared and later released through multiple SUSE security updates.
A Linux kernel vulnerability in x86/vmscape addressed by adding a conditional IBPB mitigation.
Linux kernel x86 VMSCAPE vulnerability addressed by adding a conditional indirect branch prediction barrier (IBPB) mitigation.
Linux kernel x86 VMSCAPE issue addressed through a conditional Indirect Branch Prediction Barrier (IBPB) mitigation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.