Integer Overflow Vulnerability in Linux Kernel Network Subsystem

CVE-2023-53752

What is CVE-2023-53752?

A security flaw in the Linux kernel's network subsystem has been identified, where an integer overflow in the kmalloc_reserve() function can lead to improper memory allocation. Specifically, when the size parameter exceeds 0x80000001, it is rounded up to 2^32, resulting in truncation and zero allocation. This can lead to potential crashes and unpredictable behavior, particularly when device MTU settings approach critical limits. This vulnerability stems from reports submitted to syzbot and the community, highlighting the need for diligent memory management in kernel networking.

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