CVE-2021-47509

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

24/05/2024

Last modified:

29/09/2025

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Limit the period size to 16MB Set the practical limit to the period size (the fragment shift in OSS) instead of a full 31bit; a too large value could lead to the exhaust of memory as we allocate temporary buffers of the period size, too. As of this patch, we set to 16MB limit, which should cover all use cases.

Impact

Vector 3.x

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

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::		4.4.295 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.5 (including)	4.9.293 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.258 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.221 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.165 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.85 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.8 (excluding)
cpe:2.3:o:linux:linux_kernel:5.16:rc1::::::
cpe:2.3:o:linux:linux_kernel:5.16:rc2::::::
cpe:2.3:o:linux:linux_kernel:5.16:rc3::::::
cpe:2.3:o:linux:linux_kernel:5.16:rc4::::::

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

CVE-2021-47509

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools