// For flags

CVE-2021-47604

vduse: check that offset is within bounds in get_config()

Severity Score

7.1
*CVSS v3

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: vduse: check that offset is within bounds in get_config() This condition checks "len" but it does not check "offset" and that
could result in an out of bounds read if "offset > dev->config_size".
The problem is that since both variables are unsigned the
"dev->config_size - offset" subtraction would result in a very high
unsigned value. I think these checks might not be necessary because "len" and "offset"
are supposed to already have been validated using the
vhost_vdpa_config_validate() function. But I do not know the code
perfectly, and I like to be safe.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vduse: verifique que el desplazamiento esté dentro de los límites en get_config() Esta condición verifica "len" pero no verifica "desplazamiento" y eso podría resultar en una lectura fuera de los límites si " desplazamiento > dev->config_size". El problema es que, dado que ambas variables no están firmadas, la resta "dev->config_size - offset" daría como resultado un valor sin firmar muy alto. Creo que estas comprobaciones podrían no ser necesarias porque se supone que "len" y "offset" ya se han validado mediante la función vhost_vdpa_config_validate(). Pero no conozco el código a la perfección y me gusta estar seguro.

In the Linux kernel, the following vulnerability has been resolved: vduse: check that offset is within bounds in get_config() This condition checks "len" but it does not check "offset" and that could result in an out of bounds read if "offset > dev->config_size". The problem is that since both variables are unsigned the "dev->config_size - offset" subtraction would result in a very high unsigned value. I think these checks might not be necessary because "len" and "offset" are supposed to already have been validated using the vhost_vdpa_config_validate() function. But I do not know the code perfectly, and I like to be safe.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
None
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
  • 2024-06-19 CVE Published
  • 2024-12-19 CVE Updated
  • 2025-03-19 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"
>= 5.15 < 5.15.11
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.11"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.15 < 5.16
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.16"
en
Affected