netfilter: validate user input for expected length

CVE-2024-35896

What is CVE-2024-35896?

A vulnerability in the Linux kernel's netfilter subsystem allows an attacker to exploit user input without proper length validation, leading to potential buffer overflow conditions. This issue is triggered by the setsockopt() function, where the optlen argument is disregarded, resulting in a risk of reading beyond allocated memory boundaries. Affected areas include critical network functionalities, raising concerns over memory corruption and system stability. The vulnerability surfaced in recent syzbot reports, highlighting the need for urgent scrutiny and patches to avoid exploitation.

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References