CVE-2025-39900

CVE-2025-39900: Linux kernel net_sched: gen_estimator est_timer vulnerability fixed. When CONFIG_PREEMPT_RT=y, timer callbacks could be preempted, risking seqcount/seqlock integrity. A fix in net/core/gen_estimator.c updates est_timer() by adopting preempt_disable_nested()/preempt_enable_nested()...