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CVE-2021-34458 is a critical remote code execution vulnerability in the Windows Kernel affecting Windows systems that host virtual machines on servers with SR-IOV-capable hardware. According to the provided advisory context, the flaw allows a single root input/output virtualization (SR-IOV) device assigned to one guest to potentially interfere with its PCIe sibling devices attached to other guests or to the root. The issue therefore crosses virtualization and device-isolation boundaries and can enable code execution in a context beyond the originating guest. The affected technology identified by Microsoft is the Windows Kernel, and the vulnerability is associated with SR-IOV and PCIe device interactions in virtualized environments.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Windows Kernel remote code execution vulnerability considered likely to be exploited because exploitation is not complex and requires no privileges or user interaction.
A critical Windows Kernel remote code execution vulnerability involving SR-IOV device assignment to a guest, which can potentially interfere with PCIe sibling devices attached to other guests or the root.
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.