RCU Dereference Issue in Linux Kernel: Vulnerability in linux Package
Summary
DEBIAN-CVE-2024-50005: In the Linux kernel, the following vulnerability has been resolved: mac802154: Fix potential RCU dereference issue in mac802154_scan_worker In the mac802154_scan_worker function, the scan_req->type field was accessed aft... Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The linux package is a core component of the Debian operating system, providing the essential kernel that manages system resources and hardware interactions. It is crucial for system stability and performance, enabling applications to run efficiently. This package is widely used across various environments, making its security paramount. The identified vulnerability affects the mac802154 subsystem, which is responsible for managing IEEE 802.15.4 wireless communication protocols.
Vulnerability Detail
In the Linux kernel, a vulnerability was discovered in the mac802154 subsystem, specifically within the mac802154_scan_worker function. The issue arises from accessing the scan_req->type field after the RCU read-side critical section has been released. This violation of RCU (Read-Copy-Update) rules can lead to unpredictable behavior, including potential use-after-free errors and memory corruption. The vulnerability was identified through static analysis, emphasizing the importance of adhering to RCU usage guidelines to prevent such issues.
How To Fix
Minimum fixed version
6.11.4-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the patch as soon as it becomes available.
Conclusion
The vulnerability identified in the linux package poses a significant risk due to improper handling of memory access in the mac802154 subsystem. Users are urged to update to the patched version 6.11.4-1 to mitigate potential risks. Regular monitoring and updates are essential for maintaining system security.
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FAQ
The vulnerability involves an illegal access to memory after releasing an RCU read-side critical section, which can lead to unpredictable behavior.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.
If exploited, this vulnerability could lead to system instability, memory corruption, and potential crashes, affecting overall system performance.
While the primary risk is system instability, there is a potential for data loss if the system crashes or behaves unpredictably due to this vulnerability.
It is recommended to regularly check for updates, especially after a vulnerability is disclosed, to ensure your system remains secure.
References
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