A flaw was found in the Netfilter subsystem in the Linux kernel. The xt_u32 module did not validate the fields in the xt_u32 structure. This flaw allows a local privileged attacker to trigger an out-of-bounds read by setting the size fields with a value beyond the array boundaries, leading to a crash or information disclosure.
https://www.zerodayinitiative.com/advisories/ZDI-CAN-18408/
https://bugzilla.redhat.com/show_bug.cgi?id=2226784
https://access.redhat.com/security/cve/CVE-2023-39192