Use After Free in netem Fix

CVE-2024-46800

What is CVE-2024-46800?

A vulnerability within the Linux kernel's network traffic control (netem) subsystem has been identified, exposing systems to potential use-after-free scenarios. This issue arises during packet processing in netem_dequeue(), where packets may be incorrectly managed if a specific condition is triggered, allowing for a misuse of freed memory. When netem_dequeue() enqueues a packet and receives a 'stolen' return status, the necessary backlog updates are not executed, resulting in memory management inconsistencies. This behavior can potentially be exploited by attackers to execute arbitrary code or cause system instability when specific sequences of commands are performed. The vulnerability highlights the importance of proper memory management practices in kernel development.

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