CVE-2025-39900 net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y

In the Linux kernel, the following vulnerability has been resolved: netsched: genestimator: fix esttimer vs CONFIGPREEMPTRT=y syzbot reported a WARNING in esttimer 1 Problem here is that with CONFIGPREEMPTRT=y, timer callbacks can be preempted. Adopt preemptdisablenested/preemptenablenested to fi...

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()...