Use-after-free vulnerability in libsubcmd
Summary
GSD-2022-1000296: libsubcmd: Fix use-after-free for realloc(..., 0). Affects Kernel versions >= 2f4ce5ec1d447beb42143a9653716a2ab025161e, < 3c5ba8d82f5c4df4fbe30e6c5fff49853dad19d1. 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 the kernel. The library is an integral part of the Linux Kernel and is widely used in various Linux distributions. However, a use-after-free vulnerability has been discovered in libsubcmd, which could potentially lead to security breaches and system instability.
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 use-after-free condition, where a pointer to a previously freed memory block is still being accessed. An attacker could exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The vulnerability was introduced in version v4.5 of the Linux Kernel and has been fixed in version v4.9.303.
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 apply the fix by updating the Linux Kernel to a version that includes the patch.
Conclusion
The use-after-free vulnerability in libsubcmd can have serious security implications and system instability. It is crucial to update the Linux Kernel to a version that includes the fix to mitigate the risk. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
libsubcmd is a library used in the Linux Kernel for handling subcommands. It provides functions for parsing and executing subcommands within the kernel.
A use-after-free vulnerability occurs when a program continues to use a pointer to a memory block after it has been freed. This can lead to memory corruption, crashes, and potential security vulnerabilities.
An attacker can exploit this vulnerability by crafting malicious input that triggers the use-after-free condition. This can allow them to execute arbitrary code, escalate privileges, or cause a denial-of-service condition.
The vulnerability was introduced in version v4.5 of the Linux Kernel.
Yes, the vulnerability has been fixed in version v4.9.303 of the Linux Kernel.
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