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CVE-2023-4155 is a time-of-check/time-of-use double-fetch race in Linux KVM handling of VMGEXIT events for AMD Secure Encrypted Virtualization guests using SEV-ES or SEV-SNP. A malicious multi-vCPU guest can race VMGEXIT handling to recursively invoke the handler. Repeated recursive invocation exhausts kernel stack space and causes a stack overflow. Systems built without virtual-mapped kernel stacks and their guard pages have a potentially more severe guest-to-host escape exposure.
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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.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux KVM VMGEXIT double-fetch vulnerability affecting SEV-ES and SEV-SNP virtual machines.
Linux KVM SEV-ES and SEV-SNP VMGEXIT double-fetch vulnerability.
Linux kernel KVM SEV-ES and SEV-SNP VMGEXIT double-fetch vulnerability.
Linux KVM AMD SEV-ES/SEV-SNP VMGEXIT double-fetch vulnerability.
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.