CVE-2022-33985: High severity insyde kernel vulnerability
DMA transactions which are targeted at input buffers used for the NvmExpressDxe software SMI handler could cause SMRAM corruption through a TOCTOU attack. DMA transactions which are targeted at input buffers used for the software SMI handler used by the NvmExpressDxe 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. This issue was fixed in kernel 5.2: 05.27.25, kernel 5.3: 05.36.25, kernel 5.4: 05.44.25, kernel 5.5: 05.52.25 https://www.insyde.com/security-pledge/SA-2022055
Affected Software
Event History
Frequently Asked Questions
What is CVE-2022-33985?
CVE-2022-33985 is a vulnerability that allows DMA transactions targeted at input buffers used for the NvmExpressDxe software SMI handler, which could cause SMRAM corruption through a TOCTOU attack.
What is the severity of CVE-2022-33985?
The severity of CVE-2022-33985 is high, with a severity value of 7.
Which software is affected by CVE-2022-33985?
The Insyde Kernel versions 5.2 to 5.5 are affected by CVE-2022-33985.
How can DMA transactions cause SMRAM corruption through a TOCTOU attack?
DMA transactions targeted at input buffers used for the NvmExpressDxe software SMI handler can manipulate the data during the transfer process, leading to SMRAM corruption.
What can I do to mitigate the risk of CVE-2022-33985?
To mitigate the risk of CVE-2022-33985, it is recommended to update the Insyde Kernel to a version that is not affected by the vulnerability.