CVE-2021-47509

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47509
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a Patch
https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 Patch
https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 Patch
https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 Patch
https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c Patch
https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 Patch
https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb Patch
https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc Patch
https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a Patch
https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 Patch
https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 Patch
https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 Patch
https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c Patch
https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 Patch
https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb Patch
https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc Patch
Configurations

Configuration 1 (hide)

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: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:*:*:*:*:*:*
History

29 Sep 2025, 16:30

Type Values Removed Values Added
CWE NVD-CWE-noinfo
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a - () https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a - Patch
References () https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 - () https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 - Patch
References () https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 - () https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 - Patch
References () https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 - () https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 - Patch
References () https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c - () https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c - Patch
References () https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 - () https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 - Patch
References () https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb - () https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb - Patch
References () https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc - () https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc - Patch

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a - () https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a -
References () https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 - () https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2 -
References () https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 - () https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3 -
References () https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 - () https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 -
References () https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c - () https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c -
References () https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 - () https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257 -
References () https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb - () https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb -
References () https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc - () https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc -

07 Nov 2024, 18:35

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: pcm: oss: Limitar el tamaño del período a 16 MB Establezca el límite práctico para el tamaño del período (el desplazamiento de fragmentos en OSS) en lugar de 31 bits completos; un valor demasiado grande podría provocar el agotamiento de la memoria, ya que también asignamos búferes temporales del tamaño del período. A partir de este parche, establecimos un límite de 16 MB, que debería cubrir todos los casos de uso.

24 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-24 15:15

Updated : 2025-09-29 16:30

NVD link : CVE-2021-47509

Mitre link : CVE-2021-47509

CVE.ORG link : CVE-2021-47509

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo