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CVE-2026-57092 is a critical use-after-free vulnerability in Microsoft Windows VMSwitch. The flaw can be triggered by an authorized attacker over a network from within a guest virtual machine, leading to memory corruption in the virtual switch component. Available reporting indicates the vulnerability can be exploited across the virtual machine boundary, allowing a low-privileged attacker in a guest VM to elevate privileges on the underlying host system. The issue is characterized by Microsoft as an elevation-of-privilege vulnerability, though multiple reports also describe the outcome as a guest-to-host escape that can lead to full host compromise.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation of privilege vulnerability in Windows VMSwitch.
A critical use-after-free elevation-of-privilege vulnerability in VMSwitch that enables VM escape and full host compromise.
A critical use-after-free elevation of privilege vulnerability in Microsoft Windows VMSwitch that can allow a low-privileged attacker in a VM to compromise the Hyper-V host across the VM boundary.
A VMSwitch remote code execution vulnerability noted only as the highest-scoring bug in the release.
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.