CVE-2023-53769 virt/coco/sev-guest: Double-buffer messages
A malicious host can read or tamper with SEV guest messages due to direct access to shared memory, compromising confidentiality and integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53769?
CVE-2023-53769 is a critical vulnerability in Linux, published on 8 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2023-53769?
How do I fix CVE-2023-53769?
Apply the vendor's patch.
Is CVE-2023-53769 being exploited?
There is no known exploitation of CVE-2023-53769 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53769, DEBIAN-CVE-2023-53769, GHSA-3jg5-f6fr-mw89, UBUNTU-CVE-2023-53769.