UAF Vulnerability in nfc: nci Package
Summary
GSD-2022-1002165: nfc: nci: add flush_workqueue to prevent uaf. Affects Kernel versions >= 6a2968aaf50c7a22fced77a5e24aa636281efca8, < 5c63ad2b0a267a524c12c88acb1ba9c2d109a801. No fix is published. How to fix ↓
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Background
The nfc: nci package is a component of the Linux Kernel, which is responsible for handling Near Field Communication (NFC) functionality. NFC enables communication between devices in close proximity, allowing for contactless data transfer. The nci module within the package implements the NFC Controller Interface (NCI) protocol, facilitating communication between the NFC controller and the host system. This vulnerability affects versions of the Linux Kernel from v3.2 to v5.4.190.
Vulnerability Detail
The identified vulnerability in the nfc: nci package is an use-after-free (UAF) issue. Specifically, the vulnerability arises due to a missing call to flush_workqueue, which can result in a use-after-free condition. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can manually apply the fix by adding the flush_workqueue call to the appropriate location in the code. Here is an example of the code change:
// Original code
...
// Vulnerable code
...
// Fixed code
...
flush_workqueue(workqueue);
...
Conclusion
In conclusion, the nfc: nci package in the Linux Kernel is vulnerable to a use-after-free (UAF) issue. This vulnerability can potentially be exploited to execute arbitrary code or cause a denial-of-service (DoS) condition. It is recommended to update the Linux Kernel to version v5.4.190 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The nfc: nci package is a component of the Linux Kernel that handles Near Field Communication (NFC) functionality.
The impact of this vulnerability is not yet proven, but it could potentially allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition.
To fix this vulnerability, update the Linux Kernel to version v5.4.190 or later.
Yes, a workaround is available by manually adding the flush_workqueue call to the code.
For more information, refer to the provided references link and the vulnerability details in the Open Source Vulnerability format.
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