In the Linux kernel before 6.1.6, a NULL pointer dereference bug in the traffic control subsystem allows an unprivileged user to trigger a denial of service (system crash) via a crafted traffic control configuration that is set up with “tc qdisc” and “tc class” commands. This affects qdisc_graft in net/sched/sch_api.c.
cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407
lists.debian.org/debian-lts-announce/2023/03/msg00000.html
lists.debian.org/debian-lts-announce/2023/05/msg00006.html
tldp.org/HOWTO/Traffic-Control-HOWTO/components.html
www.debian.org/security/2023/dsa-5324
www.spinics.net/lists/netdev/msg555705.html