Use After Free Vulnerability in pch_can
Summary
GSD-2021-1002586: can: pch_can: pch_can_rx_normal: fix use after free. Affects Kernel versions >= b21d18b51b31a24d17f883b678432fbdee3d5675, < 6c73fc931658d8cbc8a1714b326cb31eb71d16a7. No fix is published. How to fix ↓
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Background
The pch_can package is a component of the Linux Kernel, which is responsible for handling the Controller Area Network (CAN) protocol. CAN is a widely used communication protocol in automotive and industrial applications. The pch_can module provides support for the Intel Platform Controller Hub CAN controller. This vulnerability affects the pch_can_rx_normal function in the pch_can module.
Vulnerability Detail
The pch_can_rx_normal function in the pch_can module suffers from a use after free vulnerability. This vulnerability was introduced in version v2.6.37 of the Linux Kernel and was fixed in version v5.15.8. An attacker could exploit this vulnerability to execute arbitrary code or cause a denial of service by manipulating the CAN bus traffic. The vulnerability occurs when the pch_can_rx_normal function attempts to access a pointer that has already been freed, leading to unpredictable behavior.
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 essential to apply the provided fix by updating the Linux Kernel to the recommended version.
Conclusion
The use after free vulnerability in the pch_can module of the Linux Kernel can be exploited by attackers to execute arbitrary code or cause a denial of service. It is crucial to update the Linux Kernel to version v5.15.8 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by manipulating the CAN bus traffic.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will provide real-time alerts for open-source vulnerabilities, including this one.
At the time of this report, there is no known public exploit for this vulnerability. However, it is crucial to apply the fix as soon as possible to mitigate any potential risks.
The only effective mitigation for this vulnerability is to update the Linux Kernel to version v5.15.8 or later, which includes the fix for the use after free issue in the pch_can module.
The vulnerability was discovered by the security research team and reported to the Linux Kernel developers. The fix was subsequently implemented and released in the Linux Kernel.
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