Use-after-free vulnerability in libsubcmd
Summary
GSD-2022-1000401: libsubcmd: Fix use-after-free for realloc(..., 0). Affects Kernel versions >= 2f4ce5ec1d447beb42143a9653716a2ab025161e, < 50f3b00d4c7ba9aef6e0be4db192ee81f4f8a125. No fix is published. How to fix ↓
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Background
libsubcmd is a library used in the Linux Kernel for handling subcommands. It provides functions for parsing and executing subcommands within a larger command-line interface. The library is an integral part of the Kernel and is responsible for managing memory allocation and deallocation for subcommands. However, a use-after-free vulnerability has been discovered in libsubcmd, which can lead to potential security issues.
Vulnerability Detail
The use-after-free vulnerability in libsubcmd occurs when the realloc function is called with a size of 0. This can result in a dangling pointer, where the memory previously allocated by realloc is freed but still accessible. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service by manipulating the freed memory. The vulnerability was introduced in version v4.5 of the Linux Kernel and has been fixed in version v5.10.102.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is crucial to update to the fixed version of the Linux Kernel to mitigate the risk of exploitation.
Conclusion
The use-after-free vulnerability in libsubcmd can pose a significant security risk, allowing attackers to execute arbitrary code or cause a denial-of-service. It is crucial to update the Linux Kernel to version v5.10.102 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
libsubcmd is a library used in the Linux Kernel for handling subcommands within a command-line interface.
A use-after-free vulnerability occurs when a program continues to use a memory address after it has been freed. This can lead to memory corruption and potential security issues.
An attacker can exploit this vulnerability by manipulating the freed memory to execute arbitrary code or cause a denial-of-service.
The vulnerability was introduced in version v4.5 of the Linux Kernel. All versions between v4.5 and v5.10.101 are affected.
Yes, the vulnerability has been fixed in version v5.10.102 of the Linux Kernel.
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