Memory Overflow Risk in Linux Kernel Affects Key Functionality

CVE-2025-39793

What is CVE-2025-39793?

A vulnerability in the Linux kernel's io_uring may lead to a memory overflow if the number of pages allocated exceeds the maximum size. When casting the number of pages (nr_pages) for certain operations, the lack of proper type casting can potentially allow for this value to overflow, especially under conditions where root is utilized, bypassing normal validation checks. While typical memory usage patterns won't usually reach problematic size limits, scenarios involving elevated privileges could expose systems to unexpected behavior. It's crucial for administrators to stay informed on this issue and apply relevant updates to mitigate risks.

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