CVE-2022-33905 Race condition in n/a

High 7.0 Published 14 Nov 2022 Updated 30 Apr 2025

Attackers can corrupt SMRAM via TOCTOU in AhciBusDxe, enabling privilege escalation or code execution in Insyde BIOS.

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-2022-33905?

CVE-2022-33905 is a high-severity vulnerability in n/a, published on 14 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

DMA transactions which are targeted at input buffers used for the AhciBusDxe software SMI handler could cause SMRAM corruption (a TOCTOU attack). DMA transactions which are targeted at input buffers used for the software SMI handler used by the AhciBusDxe driver could cause SMRAM corruption through a TOCTOU attack. This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group, Fixed in kernel 5.2: 05.27.23, kernel 5.3: 05.36.23, kernel 5.4: 05.44.23, kernel 5.5: 05.52.23 https://www.insyde.com/security-pledge/SA-2022047

Weakness: CWE-367

Which versions are affected by CVE-2022-33905?

It affects 1 product.

Products include Insyde Kernel.

How do I fix CVE-2022-33905?

No fix has been published for CVE-2022-33905 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-33905 being exploited?

There is no known exploitation of CVE-2022-33905 in the wild and no public exploit code.

Sources

Also known as GHSA-p64j-wwmg-jcp6.