CVE-2022-33985
First published: Mon Nov 14 2022(Updated: )
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
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Insyde Kernel | >=5.2<5.2.05.27.25 | |
| Insyde Kernel | >=5.3<5.3.05.36.25 | |
| Insyde Kernel | >=5.4<5.4.05.44.25 | |
| Insyde Kernel | >=5.5<5.5.05.52.25 |
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Reference Links
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.
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