Critical Vulnerability in Linux Kernel: Memory Allocation Failure in rkcanfd
Summary
DEBIAN-CVE-2025-21774: In the Linux kernel, the following vulnerability has been resolved: can: rockchip: rkcanfd_handle_rx_fifo_overflow_int(): bail out if skb cannot be allocated Fix NULL pointer check in rkcanfd_handle_rx_fifo_overflow_int(... Affects linux versions < 6.12.16-1. Fixed in 6.12.16-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used in various environments, from servers to embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes, data loss, or unauthorized access. This specific vulnerability affects the CAN (Controller Area Network) subsystem, particularly in the Rockchip platform, where improper handling of memory allocation can lead to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the CAN subsystem, specifically within the rkcanfd_handle_rx_fifo_overflow_int() function. This issue arises when the system fails to properly check for NULL pointers during memory allocation for socket buffers (skbs). If the allocation fails, the function does not exit gracefully, potentially leading to a system crash or undefined behavior. The vulnerability is classified under CVE-2025-21774 and affects versions of the Linux kernel prior to 6.12.16-1.
How To Fix
Minimum fixed version
6.12.16-1
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 available for this vulnerability. The best course of action is to apply the patch as soon as it is available.
Conclusion
The vulnerability identified as CVE-2025-21774 in the Linux kernel poses a significant risk due to improper memory allocation handling in the CAN subsystem. Users are strongly advised to update their systems to the patched version to ensure stability and security. Regular monitoring for vulnerabilities using tools like Vulert can help maintain a secure environment.
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FAQ
CVE-2025-21774 is a vulnerability in the Linux kernel that affects the CAN subsystem, specifically related to memory allocation failures.
This vulnerability can lead to system crashes or undefined behavior if the kernel fails to handle memory allocation properly.
If you are using a version of the Linux kernel prior to 6.12.16-1, your system is vulnerable to this issue.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to mitigate the risk associated with this vulnerability.
References
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