A Reddit thread[1] linked to a Github page[2] with a local root
escalation exploit. This exploit works on the current "bookworm"
stable kernel, 6.1.0-18-amd64.
It can be worked around by blocking the n_gsm driver:
echo 'blacklist n_gsm' | sudo tee -a /etc/modprobe.d/blacklist-gsm.conf
sudo rmmod n_gsm