Memory Corruption in Linux Kernel BPF

Executive Summary

This vulnerability exists in the Linux kernel's bpf subsystem, specifically in the function arena_alloc_pages(). The function accepts a node_id parameter as a plain integer but does not perform any bounds checking on it before forwarding it through the allocation chain.

The issue was that node_id could be invalid or out of expected range, potentially causing unexpected behavior or errors during memory allocation. The fix involved adding validation of node_id before it is passed down the allocation chain in arena_alloc_pages().

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Impact Analysis

Improper validation of node_id in memory allocation could lead to memory corruption, crashes, or other unpredictable behavior in the Linux kernel. This could affect system stability and security, potentially allowing attackers to exploit the kernel for privilege escalation or denial of service.

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