CVE-2025-21980 — sched: address a potential NULL pointer dereference in the GRED scheduler.

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

sched: address a potential NULL pointer dereference in the GRED scheduler.

If kzalloc in gred_init returns a NULL pointer, the code follows the error handling path, invoking gred_destroy. This, in turn, calls gred_offload, where memset could receive a NULL pointer as input, potentially leading to a kernel crash.

When table->opt is NULL in gred_init(), gred_change_table_def() is not called yet, so it is not necessary to call ->ndo_setup_tc() in gred_offload().

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CVE-2025-21980 — sched: address a potential NULL pointer dereference in the GRED scheduler.