Bug 2419909 (CVE-2023-53769)

Summary: CVE-2023-53769 kernel: virt/coco/sev-guest: Double-buffer messages
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-08 07:07:56 UTC 
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.
Comment 1 Jon Moroney 2025-12-08 20:30:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120846-CVE-2023-53769-1a8b@gregkh/T