CVE-2021-47509

ALSA: pcm: oss: Limit the period size to 16MB

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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.

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.

*Credits: N/A

CVSS Scores

CISAv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-24 CVE Reserved
2024-05-24 CVE Published
2024-05-25 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bcc	2021-12-14
https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257	2021-12-14
https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aeb	2021-12-14
https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28a	2021-12-14
https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3	2021-12-14
https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43c	2021-12-14
https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2	2021-12-14
https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2	2021-12-02

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.4.295 Search vendor "Linux" for product "Linux Kernel" and version " < 4.4.295"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.9.293 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.293"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.258 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.258"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.19.221 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.221"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.165 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.165"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.85 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.85"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.8 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.8"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.16 Search vendor "Linux" for product "Linux Kernel" and version " < 5.16"		en		Affected