CVE-2021-26396 Memory corruption in 3rd Gen EPYC
Insufficient address validation in AMD Secure Processor allows attackers to corrupt memory integrity in SNP guests, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26396?
CVE-2021-26396 is a medium-severity memory corruption vulnerability in Amd Epyc 72f3 Firmware, published on 10 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Insufficient validation of address mapping to IO in ASP (AMD Secure Processor) may result in a loss of memory integrity in the SNP guest.
Weakness: CWE-345
Which versions are affected by CVE-2021-26396?
It affects 24 products.
Products include Amd Epyc 7003 Firmware, Amd Epyc 72f3 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 7373x Firmware and 18 more.
How do I fix CVE-2021-26396?
No fix has been published for CVE-2021-26396 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-2021-26396 being exploited?
There is no known exploitation of CVE-2021-26396 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 72f3 Firmware
Sources
Also known as GHSA-82wg-vgc4-3633.