Fix NULL pointer dereference in udf_symlink function in Kernel
Summary
GSD-2021-1001456: udf: Fix NULL pointer dereference in udf_symlink function. Affects Kernel versions < 371566f63cbd0bb6fbb25b8fe9d5798268d35af9. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities, such as process management, memory management, and device drivers. The udf_symlink function in the Kernel is responsible for creating symbolic links in the Universal Disk Format (UDF) filesystem. However, a vulnerability has been identified in this function that can lead to a NULL pointer dereference.
Vulnerability Detail
The vulnerability in the udf_symlink function arises from a failure to handle NULL pointers correctly. An attacker can exploit this flaw by crafting a malicious UDF filesystem that triggers the NULL pointer dereference, resulting in a system crash or potential code execution. The impact of this vulnerability can range from denial of service to arbitrary code execution with kernel-level privileges. It is important to note that this vulnerability has not been proven to be exploitable in real-world scenarios.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the Kernel, there is no specific workaround available. It is recommended to update to the patched version.
Conclusion
The vulnerability in the udf_symlink function of the Kernel can lead to a NULL pointer dereference, potentially resulting in a system crash or code execution. It is crucial to update the Kernel to the fixed version to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability can range from denial of service to arbitrary code execution with kernel-level privileges.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) to the playground, and it will alert you in real-time if the vulnerability is detected.
The exploitability of this vulnerability in real-world scenarios has not been proven yet.
There are no known instances of this vulnerability being exploited in the wild.
If your system is affected, it is recommended to update your Kernel to the fixed version (v4.9.276 or later) as soon as possible.
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