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CVE-2025-21335 is an elevation-of-privilege vulnerability in Windows Hyper-V NT Kernel Integration VSP. Available reporting identifies the flaw as a use-after-free condition in the NT Kernel Integration VSP component used by Hyper-V. By triggering reuse of previously freed memory in this virtualization-related kernel component, an attacker can corrupt execution state and obtain elevated privileges on the affected Windows system. The vulnerability was identified as being actively exploited in the wild at the time of patch release.
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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.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Hyper-V NT Kernel Integration VSP elevation of privilege vulnerability that Microsoft reports is being actively exploited in the wild.
A Windows Hyper-V NT Kernel Integration VSP elevation-of-privilege vulnerability that Microsoft reports is actively exploited in the wild.
An actively exploited privilege escalation vulnerability in the Windows Hyper-V NT Kernel Integration VSP driver caused by a use-after-free condition, allowing a local authenticated attacker to gain SYSTEM privileges.
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.