CVE-2021-47477

comedi: dt9812: fix DMA buffers on stack

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.

5.3

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.77% Top 30%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723
https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2
https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97
https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3
https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe
https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6
https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed
https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e
https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3

Frequently Asked Questions

What is the severity of CVE-2021-47477?: CVE-2021-47477 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47477?: To fix CVE-2021-47477, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47477 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-47477 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47477?: CVE-2021-47477 affects Linux Linux, Linux Linux.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.