CVE-2024-50253

Summary

CVE-2024-50253 is a vulnerability in the Linux kernel that affects the bpf (Berkeley Packet Filter) subsystem. The issue lies in the function bpf_iter_bits_new(), where the validation of nr_words is bypassed. If nr_bits multiplied by nr_words results in an overflow, stack corruption may occur due to bpf_probe_read_kernel_common, leading to potential security risks. The vulnerability is resolved by limiting nr_words to a maximum value of 511, a size derived from the current BPF memory allocator implementation. To maintain compatibility with future changes to the BPF memory allocator, developers should use the helper function bpf_mem_alloc_check_size() to check for oversized nr_bytes, and return -E2BIG instead of -ENOMEM for such cases.

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