Integer Overflow Vulnerability in Linux Kernel Affects Networking Features

CVE-2025-21711

What is CVE-2025-21711?

The Linux kernel has a vulnerability in the networking subsystem, specifically within the rose_setsockopt() function. This issue arises from the potential for integer overflows when unexpectedly large arguments are passed. This could lead to unexpected behavior or crashes in the application. The fix includes input validation to ensure that the contents of the 'opt' parameter are within acceptable limits, returning an error if they exceed predefined thresholds. This enhancement not only addresses the integer overflow risk but also updates the data type to unsigned int and removes unnecessary checks for negative values, reinforcing the stability and security of the kernel's networking capabilities.

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