CVE-2021-26403 Information disclosure in 1st Gen EPYC
A malicious hypervisor can disclose the launch secret, compromising the confidentiality of virtual machines running on AMD EPYC processors.
- 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-2021-26403?
CVE-2021-26403 is a medium-severity vulnerability in Amd Epyc 7232p 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 checks in SEV may lead to a malicious hypervisor disclosing the launch secret potentially resulting in compromise of VM confidentiality.
Weakness: CWE-345
Which versions are affected by CVE-2021-26403?
It affects 41 products.
Products include Amd Epyc 7001 Firmware, Amd Epyc 7002 Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7251 Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7261 Firmware and 35 more.
How do I fix CVE-2021-26403?
No fix has been published for CVE-2021-26403 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-26403 being exploited?
There is no known exploitation of CVE-2021-26403 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 7232p Firmware
- CVE-2021-26340 A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation
- CVE-2021-26398 Memory corruption in 1st Gen EPYC
- CVE-2021-26331 Code injection in 1st Gen AMD EPYC™
- CVE-2021-26335 Code injection in Athlon™ Series
- CVE-2023-20578 Race condition in AMD EPYC™ 7001 Processors
Sources
Also known as GHSA-cfcv-rgx7-fw5j.