Based on similar “use after free” kernel messages mentioned in the forum this is likely to be a bug in either the kernel directly or in a driver for one of your system components.
Basically something is trying to access memory locations after they were de-allocated.
Hopefully this will get fixed in one of the next kernel updates.
The current release CU181 has kernel 6.1.61 which was updated from 6.1.45 in CU 180.
CU 182 which is in Testing phase has kernel 6.1.62.
CU 183 which is still in build phase will currently have kernel 6.6.8
The message you are seeing is the kernel detecting that there is a problem and stopping anything using it. The KFENCE name stands for Kernel Electric Fence and you can get more details here
https://docs.kernel.org/dev-tools/kfence.html
This message has been previously flagged in the forum as related to a bug in a driver for a NIC that was then fixed by a later kernel update.
https://community.ipfire.org/t/bug-kfence-use-after-free-read-in-ipt-do-t/6888