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

What is CVE-2021-26340?

CVE-2021-26340 is a high-severity vulnerability in Amd Epyc 7232p Firmware, published on 10 Dec 2021.

Official description

A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM).

Which versions are affected by CVE-2021-26340?

It affects 105 products.

Products include Amd Epyc 7001 Firmware, Amd Epyc 7232p Firmware, Amd Epyc 7251 Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7261 Firmware, Amd Epyc 7262 Firmware and 99 more.

How do I fix CVE-2021-26340?

No fix has been published for CVE-2021-26340 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-26340 being exploited?

There is no known exploitation of CVE-2021-26340 in the wild and no public exploit code.

Other vulnerabilities in Amd Epyc 7232p Firmware

• CVE-2021-26398 Memory corruption in 1st Gen EPYC High 7.8
• CVE-2021-26331 Code injection in 1st Gen AMD EPYC™ High 7.8
• CVE-2021-26335 Code injection in Athlon™ Series High 7.8
• CVE-2023-20578 Race condition in AMD EPYC™ 7001 Processors High 7.5
• CVE-2020-12988 Denial of service in 1st/2nd/3rd Gen AMD EPYC™ Processors High 7.5

All Amd Epyc 7232p Firmware vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8qrv-qg3h-g8m6.