A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
https://bugzilla.redhat.com/show_bug.cgi?id=2226777