Use-after-free vulnerability in net: fix tw_timer_handler
Summary
GSD-2022-1000030: net: fix use-after-free in tw_timer_handler. Affects Kernel versions >= 61a7e26028b94805fd686a6dc9dbd9941f8f19b0, < fe5838c22b986c1190f1dce9aa09bf6a491c1a69. No fix is published. How to fix ↓
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Background
The net package is a crucial component of the Linux Kernel, responsible for managing network protocols, connections, and data transmission. It provides the necessary functionality for networking operations within the operating system. However, a use-after-free vulnerability has been discovered in the tw_timer_handler function of the net package.
Vulnerability Detail
The use-after-free vulnerability in tw_timer_handler arises when a timer wheel entry is freed while still being referenced. This can lead to a situation where a subsequent attempt to access the freed memory can result in a crash or potential code execution. Attackers may exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition. The vulnerability was introduced in version v2.6.27 of the Linux Kernel and has been fixed in version v5.4.170 by commit fe5838c22b986c1190f1dce9aa09bf6a491c1a69.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, it is recommended to disable or limit the usage of the affected functionality until the Linux Kernel can be updated. This can be achieved by modifying the relevant configuration files or disabling specific network protocols that rely on the vulnerable code. However, it is crucial to note that workarounds may not provide complete protection and updating to the fixed version is still the recommended solution.
Conclusion
The use-after-free vulnerability in tw_timer_handler of the net package in the Linux Kernel can lead to potential code execution or denial-of-service attacks. It is crucial to update the Linux Kernel to version v5.4.170 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The net package is a component of the Linux Kernel that handles network protocols, connections, and data transmission. It provides essential functionality for networking operations within the operating system.
A use-after-free vulnerability occurs when a program continues to reference memory after it has been freed. This can lead to crashes, code execution, or other security issues.
The use-after-free vulnerability in tw_timer_handler can be exploited by attackers to execute arbitrary code or cause a denial-of-service condition. It is crucial to patch this vulnerability to prevent potential security breaches.
To fix this vulnerability, update the Linux Kernel to version v5.4.170 or later. Detailed instructions can be found in the 'how_to_fix' section of this report.
As a temporary workaround, you can disable or limit the usage of the affected functionality until the Linux Kernel can be updated. However, it is important to note that workarounds may not provide complete protection, and updating to the fixed version is still recommended.
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