CVE-2026-53270

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

ipvs: clear the svc scheduler ptr early on edit

ip_vs_edit_service() while unbinding the old scheduler clears

the svc->scheduler ptr after the scheduler module initiates

RCU callbacks. This can cause packets to use the old

scheduler at the time when svc->sched_data is already freed

after RCU grace period.

Fix it by clearing the ptr early in ip_vs_unbind_scheduler(),

before the done_service method schedules any RCU callbacks.

Also, if the new scheduler fails to initialize when replacing

the old scheduler, try to restore the old scheduler while still

returning the error code.