CVE-2022-33906
First published: Mon Nov 14 2022(Updated: )
DMA transactions which are targeted at input buffers used for the FwBlockServiceSmm 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 FwBlockServiceSmm 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, 5.3: 05.36.23, 5.4: 05.44.23, 5.5: 05.52.23 https://www.insyde.com/security-pledge/SA-2022048
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Insyde Kernel | >=5.2<5.2.05.27.23 | |
| Insyde Kernel | >=5.3<5.3.05.36.23 | |
| Insyde Kernel | >=5.4<5.4.05.44.23 | |
| Insyde Kernel | >=5.5<5.5.05.52.23 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2022-33906?
The severity of CVE-2022-33906 is medium with a score of 6.4.
How can DMA transactions targeted at input buffers used for the FwBlockServiceSmm software SMI handler cause SMRAM corruption?
DMA transactions targeted at input buffers used for the FwBlockServiceSmm software SMI handler can cause SMRAM corruption through a TOCTOU attack.
Which versions of Insyde Kernel are affected by CVE-2022-33906?
Versions 5.2 to 5.5 of Insyde Kernel are affected by CVE-2022-33906.
Is there a security pledge or statement from Insyde regarding CVE-2022-33906?
Yes, Insyde has a security pledge which can be found at their website.
Where can I find more information about CVE-2022-33906?
You can find more information about CVE-2022-33906 at the Siemens CERT Portal and Insyde's security pledge page.
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