Welcome to our detailed look at CVE-2024-40911, a recently disclosed vulnerability affecting the Linux kernel. This article aims to demystify the technical details and provide actionable insights for our LinuxPatch customers to ensure your systems remain secure. Let’s break down the severity, affected components, and recommended mitigations for this cybersecurity concern.
CVE-2024-40911 is identified with a medium severity level and a CVSS score of 5.5. The flaw was discovered in the cfg80211 component of the Linux kernel—a crucial element responsible for configuration and management in wireless devices. Specifically, the vulnerability revolves around improper locking when accessing wireless network interface statistics via cfg80211_get_station.
The primary issue stems from the kernel’s handling of certain wireless operations where the wiphy (wireless hardware device) needs to remain locked to ensure data integrity. Without proper locking, concurrent operations can lead to a kernel NULL pointer dereference, causing the system to crash. This type of error not only disrupts service but could potentially offer an avenue for exploitation by malicious entities.
To fully appreciate the severity and implications of CVE-2024-40911, let's delve into the specifics of the error as reported in the Linux kernel. The vulnerability manifests as a NULL pointer dereference within ath10k_sta_statistics, a function part of the ath10k_core module designed for handling statistics of station interfaces in wireless networks.
The problem occurs when the sta_set_sinfo function, which updates station info, and ath10k_sta_state function, which manages the state of station entries, are executed without the necessary lock on wiphy. This leads to a scenario where the disconnected station's data is prematurely accessed, causing memory corruption and a subsequent system failure.
Due to the nature of the defect—occurring within the management of network interfaces—the immediate impact is typically a denial of service (DoS) through system crashes. However, the potential for further exploitation adds a layer of risk, particularly in systems where integrity and availability of wireless communications are critical.
This vulnerability predominantly affects Linux distributions that utilize the ath10k_core or similar modules dependent on cfg80211 for wireless management. Devices ranging from personal computers with Linux-based operating systems to larger servers and embedded devices in an IoT environment could be at risk if not patched timely.
The resolution for CVE-2024-40911 involves applying patches that have been issued in response to the discovery of this flaw. Linux users should prioritize updating their systems with the latest kernel patches to mitigate the risks associated with this vulnerability. The patch specifically addresses the locking mechanism in the cfg80211_get_station function to ensure that the wiphy is appropriately secured during operations that access station data.
For LinuxPatch customers, we provide streamlined patch management solutions that simplify the deployment of these critical updates. Ensuring your operating system and modules like ath10k are up-to-date is paramount in maintaining the security and stability of your systems.
CVE-2024-40911 highlights the importance of system integrity and proper handling of concurrent operations in the Linux kernel’s wireless management functionalities. By understanding the details and potential impacts of such vulnerabilities, users and administrators can better safeguard their systems against potential disruptions and malicious exploits.
Always stay informed and prepared by keeping your systems patched and monitoring for any emerging threats. If you need assistance in deploying updates or have concerns about CVE-2024-40911, our LinuxPatch team is here to help.