Vulnerability in iwlwifi: mvm: check debugfs_dir ptr before use
Summary
GSD-2022-1000782: iwlwifi: mvm: check debugfs_dir ptr before use. Affects Kernel versions >= 8c082a99edb997d7999eb7cdb648e47a2bf4a638, < 7de1ed755e1ace30d97a724bad32452ed86b653b. No fix is published. How to fix ↓
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Background
The iwlwifi package is a part of the Linux Kernel ecosystem and is responsible for managing Intel wireless devices. It provides the necessary drivers and firmware for these devices to function properly. The iwlwifi package includes a component called mvm (mac80211 virtual machine) which handles the virtualization of wireless devices. This component utilizes a debugfs directory (debugfs_dir) for debugging and troubleshooting purposes. However, a vulnerability has been discovered in the iwlwifi mvm module that allows an attacker to exploit a null pointer dereference when accessing the debugfs_dir pointer. This vulnerability can potentially lead to a denial-of-service (DoS) attack or arbitrary code execution.
Vulnerability Detail
The vulnerability in the iwlwifi mvm module arises from a lack of proper validation of the debugfs_dir pointer before its use. By exploiting this flaw, an attacker can trigger a null pointer dereference, causing the system to crash or potentially execute arbitrary code. The vulnerability was introduced in version v5.12 of the Linux Kernel and has been fixed in version v5.15.27. It is important to update to the latest version to mitigate the risk associated with this vulnerability.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, as a general security practice, it is advisable to implement strict access controls and restrict access to sensitive system components. Additionally, monitoring and analyzing system logs can help detect any suspicious activity related to this vulnerability.
Conclusion
The vulnerability in the iwlwifi mvm module can be mitigated by updating the Linux Kernel to version v5.15.27 or later. It is crucial to regularly update the kernel and apply security patches to ensure the system is protected against known vulnerabilities. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
iwlwifi is a package in the Linux Kernel ecosystem that provides drivers and firmware for Intel wireless devices.
The iwlwifi mvm module is responsible for virtualizing wireless devices in the Linux Kernel.
A null pointer dereference occurs when a program attempts to access or manipulate memory using a null pointer, resulting in a crash or potential code execution.
This vulnerability can lead to a denial-of-service (DoS) attack or arbitrary code execution, depending on how it is exploited.
Updating the Linux Kernel to version v5.15.27 or later is the recommended mitigation strategy. Regularly applying security patches and following best practices for system hardening can also help reduce the risk.
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