Critical NULL Pointer Dereference Vulnerability in Linux Kernel Package
Summary
DEBIAN-CVE-2024-49941: In the Linux kernel, the following vulnerability has been resolved: gpiolib: Fix potential NULL pointer dereference in gpiod_get_label() In gpiod_get_label(), it is possible that srcu_dereference_check() may return a NUL... Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages system resources and hardware communication, providing essential services for software applications. The kernel is designed to be robust and secure, but vulnerabilities can arise, potentially compromising system stability and security. This specific vulnerability affects the gpiolib subsystem, which handles GPIO (General Purpose Input/Output) pins, allowing software to interact with hardware components.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the gpiolib subsystem, specifically within the function gpiod_get_label(). The issue arises when the function srcu_dereference_check() returns a NULL pointer, leading to a potential NULL pointer dereference when accessing label->str. If the label pointer is NULL, accessing label->str can cause a system crash or unexpected behavior. This vulnerability could be exploited in scenarios where GPIO labels are accessed without proper validation, potentially leading to system instability.
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 mentioned for this vulnerability. The best course of action is to apply the patch by updating the package as described above.
Conclusion
The identified vulnerability in the Linux kernel's gpiolib subsystem poses a significant risk due to potential NULL pointer dereference issues. It is crucial for users to update to the patched version to ensure system stability and security. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the integrity of your software.
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FAQ
The vulnerability can lead to a NULL pointer dereference, potentially causing system crashes or unexpected behavior when accessing GPIO labels.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
Yes, a patch is available in version 6.11.4-1 of the Linux package. It is recommended to update to this version or later.
While there are no specific workarounds, it is crucial to prioritize updating the package to mitigate the risk associated with this vulnerability.
Detailed information can be found in the Debian CVE database at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49941.json.
References
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