cbq_classify in net/sched/sch_cbq.c in the Linux kernel through 6.1.4 allows attackers to cause a denial of service (slab-out-of-bounds read) because of type confusion (non-negative numbers can sometimes indicate a TC_ACT_SHOT condition rather than valid classification results).
https://www.openwall.com/lists/oss-security/2023/01/10/4
https://www.openwall.com/lists/oss-security/2023/01/10/1
https://www.debian.org/security/2023/dsa-5324
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html