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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00062.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux
  • Linux Kernel
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e cve-icon cve-icon
https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2 cve-icon cve-icon
https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3 cve-icon cve-icon
https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed cve-icon cve-icon
https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe cve-icon cve-icon
https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3 cve-icon cve-icon
https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6 cve-icon cve-icon
https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97 cve-icon cve-icon
https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024052236-CVE-2021-47477-955e@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47477 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47477 cve-icon
History

Wed, 24 Sep 2025 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Wed, 06 Nov 2024 20:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L'}

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Mon, 04 Nov 2024 12:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T07:11:51.469Z

Reserved: 2024-05-22T06:20:56.200Z

Link: CVE-2021-47477

cve-icon Vulnrichment

Updated: 2024-08-04T05:39:59.539Z

cve-icon NVD

Status : Analyzed

Published: 2024-05-22T09:15:09.677

Modified: 2025-09-24T19:00:23.310

Link: CVE-2021-47477

cve-icon Redhat

Severity : Low

Publid Date: 2024-05-22T00:00:00Z

Links: CVE-2021-47477 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-12T22:23:28Z