CVE-2023-53769
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
In the Linux kernel, the sev-guest module now double-buffers messages. Previously, encryption algorithms read and wrote directly to shared unencrypted memory, potentially leaking information and allowing the host to tamper with message integrity.
Risk Assessment
Risk of sensitive data leakage and integrity compromise in SEV-Guest communication, which could be exploited by a malicious host.
Recommendation
Install Linux kernel updates containing this fix. Ensure environments using SEV-Guest are updated.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: virt/coco/sev-guest: Double-buffer messages The encryption algorithms read and write directly to shared unencrypted memory, which may leak information as well as permit the host to tamper with the message integrity. Instead, copy whole messages in or out as needed before doing any computation on them.