CVE-2021-47477

Severity CVSS v4.0:

Pending analysis

Type:

CWE-787 Out-of-bounds Write

Publication date:

22/05/2024

Last modified:

24/09/2025

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.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	2.6.29 (including)	4.4.292 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.5 (including)	4.9.290 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.255 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.217 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.159 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.79 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.14.18 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.15 (including)	5.15.2 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47477

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools