CVE-2021-26356 Race condition in 1st Gen AMD EPYC™ Processors
A time-of-check time-of-use race condition in the AMD bootloader allows attackers to tamper with SPI ROM, leading to data corruption and information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-26356?
CVE-2021-26356 is a high-severity vulnerability in Amd Epyc 7232p Firmware, published on 9 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A TOCTOU in ASP bootloader may allow an attacker to tamper with the SPI ROM following data read to memory potentially resulting in S3 data corruption and information disclosure.
Weakness: CWE-367
Which versions are affected by CVE-2021-26356?
It affects 98 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 92 more.
How do I fix CVE-2021-26356?
No fix has been published for CVE-2021-26356 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-26356 being exploited?
There is no known exploitation of CVE-2021-26356 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-8c2m-2hmv-32px.