// For flags

CVE-2021-47511

ALSA: pcm: oss: Fix negative period/buffer sizes

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix negative period/buffer sizes The period size calculation in OSS layer may receive a negative value
as an error, but the code there assumes only the positive values and
handle them with size_t. Due to that, a too big value may be passed
to the lower layers. This patch changes the code to handle with ssize_t and adds the proper
error checks appropriately.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: pcm: oss: corrige tamaños de período/búfer negativos El cálculo del tamaño del período en la capa OSS puede recibir un valor negativo como error, pero el código allí asume solo los valores positivos y manejarlos con size_t. Debido a esto, es posible que se pase un valor demasiado grande a las capas inferiores. Este parche cambia el código para manejar con ssize_t y agrega las comprobaciones de errores adecuadas.

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix negative period/buffer sizes The period size calculation in OSS layer may receive a negative value as an error, but the code there assumes only the positive values and handle them with size_t. Due to that, a too big value may be passed to the lower layers. This patch changes the code to handle with ssize_t and adds the proper error checks appropriately.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-24 CVE Reserved
  • 2024-05-24 CVE Published
  • 2024-12-19 CVE Updated
  • 2025-03-29 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
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