Use-after-free vulnerability in aio package
Summary
GSD-2021-1002516: aio: fix use-after-free due to missing POLLFREE handling. Affects Kernel versions >= 2c14fa838cbefc23cf1c73ca167ed85b274b2913, < 47ffefd88abfffe8a040bcc1dd0554d4ea6f7689. No fix is published. How to fix ↓
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Background
The aio package is a component of the Linux Kernel, which is responsible for handling asynchronous I/O operations. Asynchronous I/O allows multiple I/O operations to be performed concurrently, improving system performance. The aio package is an integral part of the Linux Kernel and is widely used in various Linux distributions.
Vulnerability Detail
The identified vulnerability in the aio package is a use-after-free issue caused by missing POLLFREE handling. This vulnerability can potentially be exploited by an attacker to execute arbitrary code or cause a denial of service. The use-after-free vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed, leading to unpredictable behavior and potential security risks. The vulnerability was introduced in version v4.18 of the Linux Kernel and has been fixed in version v5.10.85.
How To Fix
No fixed version is published for this vulnerability.
To fix the use-after-free vulnerability in the aio package, it is recommended to update the Linux Kernel to version v5.10.85 or later. This update includes the necessary fix for the vulnerability. Users can obtain the updated version of the Linux Kernel from the official Linux Kernel repository: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
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Workaround
No specific workaround has been provided for this vulnerability.
Conclusion
The use-after-free vulnerability in the aio package of the Linux Kernel can pose a significant security risk if left unpatched. It is crucial to update to version v5.10.85 or later to fix this vulnerability. For further support and assistance in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The use-after-free vulnerability in the aio package can potentially allow an attacker to execute arbitrary code or cause a denial of service.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze and alert you in real-time if any open-source vulnerabilities, including this use-after-free vulnerability, are detected.
Yes, a patch for this vulnerability is available in version v5.10.85 of the Linux Kernel. It is recommended to update to this version or a later version to fix the vulnerability.
The exact exploitability of this vulnerability has not been proven. However, if successfully exploited, it could potentially be done remotely.
There are no known instances of this vulnerability being exploited in the wild. However, it is important to apply the necessary updates to mitigate the risk.
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