Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: dt9812: fix DMA buffers on stack USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail. Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data. Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.29, < 4.4.292 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757ePatch
- https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2Patch
- https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3Patch
- https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12edPatch
- https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efePatch
- https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3Patch
- https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6Patch
- https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97Patch
- https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723Patch
- https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757ePatch
- https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2Patch
- https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3Patch
- https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12edPatch
- https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efePatch
- https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3Patch
FAQ
What is CVE-2021-47477?
CVE-2021-47477 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: comedi: dt9812: fix DMA buffers on stack USB transfer buffers are typically mapped for DMA and must not be allocated on the stack ...
How severe is CVE-2021-47477?
CVE-2021-47477 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47477?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.