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CVE-2021-47509 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CNA: CISA-ADPCVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a	kernel.org	Patch
https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2	kernel.org	Patch
https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3	kernel.org	Patch
https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2	kernel.org	Patch
https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c	kernel.org	Patch
https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257	kernel.org	Patch
https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb	kernel.org	Patch
https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc	kernel.org	Patch
https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a	CVE	Patch
https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2	CVE	Patch
https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3	CVE	Patch
https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2	CVE	Patch
https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c	CVE	Patch
https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257	CVE	Patch
https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb	CVE	Patch
https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc	CVE	Patch

see all 16 references

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]

Affected Products

Product	Versions
linux linux kernel	< 4.4.295 >= 4.5, < 4.9.293 >= 4.10, < 4.14.258 >= 4.15, < 4.19.221 >= 4.20, < 5.4.165
CPE cpe:2.3:o:linux:linux_kernel:::::::: 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:::::: Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 17, 2026	CVE Modified	kernel.org
Sep 29, 2025	Initial Analysis	[email protected]
Nov 21, 2024	CVE Modified	CVE
Nov 7, 2024	CVE Modified	CISA-ADP
May 28, 2024	CVE Modified	kernel.org
May 24, 2024	New CVE Received	kernel.org