Use-after-free vulnerability in net: dsa: mv88e6xxx
Summary
GSD-2022-1000377: net: dsa: mv88e6xxx: fix use-after-free in mv88e6xxx_mdios_unregister. Affects Kernel versions >= 8ccebe77df6e0d88c72ba5e69cf1835927e53b6c, < 22249886dc5bc3d6bcc212f07e65b49d85c582fe. No fix is published. How to fix ↓
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Background
The affected package is the Linux Kernel, specifically the net: dsa: mv88e6xxx module. This module is responsible for managing the Marvell 88E6xxx series of Ethernet switches. These switches are commonly used in network infrastructure devices. The vulnerability in question is a use-after-free issue that occurs during the unregistering process of the mdios subsystem. This vulnerability can potentially be exploited by an attacker to execute arbitrary code or cause a denial-of-service condition.
Vulnerability Detail
The use-after-free vulnerability in the net: dsa: mv88e6xxx module occurs when the mdios subsystem is unregistered. The issue arises due to improper handling of memory deallocation, leading to a situation where a pointer to freed memory is still accessible. An attacker can potentially exploit this vulnerability by manipulating the freed memory to execute arbitrary code or cause a crash in the system. The impact of this vulnerability can range from privilege escalation to a complete system compromise, depending on the attacker's capabilities and the context in which the vulnerable code is executed.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the net: dsa: mv88e6xxx module if it is not required for their system. This can be done by blacklisting the module or removing it from the kernel configuration. However, this workaround should only be considered temporary, as it does not address the root cause of the vulnerability and may limit the functionality of the system.
Conclusion
The use-after-free vulnerability in the net: dsa: mv88e6xxx module can have serious security implications, potentially leading to arbitrary code execution or system crashes. It is crucial to update the Linux Kernel to version v5.10.101 or later to mitigate this vulnerability. Users can also consider disabling the module as a temporary workaround, but this should not be seen as a long-term solution. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The net: dsa: mv88e6xxx module is a component of the Linux Kernel responsible for managing the Marvell 88E6xxx series of Ethernet switches. These switches are commonly used in network infrastructure devices.
A use-after-free vulnerability occurs when a program continues to use a pointer to memory that has been freed. This can lead to various security issues, including the execution of arbitrary code or a system crash.
An attacker can potentially exploit this vulnerability by manipulating the freed memory to execute arbitrary code or cause a crash in the system. The specific attack vector would depend on the context in which the vulnerable code is executed.
The impact of this vulnerability can range from privilege escalation to a complete system compromise, depending on the attacker's capabilities and the context in which the vulnerable code is executed.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.101 or later. This can be done by downloading the latest kernel source code from the official Linux Kernel repository and compiling it for the target system.
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