CVE-2021-47416
Linux Kernel MDIO Bus Interface Memory Leaks Through Incorrect State Management
Description
In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
May 21, 2024, 4:53 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47416
.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47416
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47416
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure. Added Reference kernel.org https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47416
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47416
weaknesses.