Just ran into this ourselves...on this router back in late September I stopped pcscd but I didn't bother installing the patch since 21.09 was presumably imminent. Fast forward a few months and we're setting up IPSec, with pcscd long stopped. Diag/activity showed 88% idle at the top, yet had the lines for charon and syslogd and the idle/CPU entries were only a few percent. Starting pcscd dropped CPU use to normal. Patch + stop IPSec + stop pcscd + start IPSec fixed it.