CVE-2021-26311 AMD Secure Encrypted Virtualization
A malicious hypervisor can rearrange guest memory undetected by attestation, potentially leading to arbitrary code execution within the guest VM.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26311?
CVE-2021-26311 is a high-severity memory corruption vulnerability in AMD SEV/SEV-ES, published on 13 May 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In the AMD SEV/SEV-ES feature, memory can be rearranged in the guest address space that is not detected by the attestation mechanism which could be used by a malicious hypervisor to potentially lead to arbitrary code execution within the guest VM if a malicious administrator has access to compromise the server hypervisor.
Weakness: CWE-77
Which versions are affected by CVE-2021-26311?
It affects 65 products.
Products include Amd Epyc 7232p, Amd Epyc 7251, Amd Epyc 7252, Amd Epyc 7261, Amd Epyc 7262, Amd Epyc 7272 and 59 more.
How do I fix CVE-2021-26311?
No fix has been published for CVE-2021-26311 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-26311 being exploited?
There is no known exploitation of CVE-2021-26311 in the wild and no public exploit code.
Other vulnerabilities in AMD SEV/SEV-ES
Sources
Also known as GHSA-2v8q-5wcx-2f5j.