Use After Free Vulnerability in Linux Kernel Affects Memory Management

CVE-2025-40270

What is CVE-2025-40270?

A vulnerability in the Linux kernel's memory management subsystem can lead to a use after free condition during virtual memory area (VMA) readahead. The issue arises when the readahead function attempts to access swap entries from a different swap device without holding a reference, particularly in race conditions where swapoff is executed on one device while swapin is happening on another. Though difficult to exploit, this vulnerability could potentially lead to significant stability and security issues within the operating system.

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