Memory Management Issue in Linux Kernel's FEC Driver

CVE-2025-21676

Summary

A vulnerability exists in the Linux kernel's FEC driver where the fec_enet_update_cbd function fails to properly manage memory allocation errors. Specifically, when calling the page_pool_dev_alloc_pages function, a NULL pointer can be used — which leads to system crashes under memory pressure. This issue may not occur frequently but can surface during high-load scenarios, such as writing over a SMB share. The proper fix involves dropping the current packet when a memory allocation error is detected to ensure system stability.

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